NCSC-2026-0185

Vulnerability from csaf_ncscnl - Published: 2026-06-09 18:35 - Updated: 2026-06-09 18:35
Summary
Kwetsbaarheden verholpen in Microsoft Exchange
Notes
The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions: NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein. NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory. This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings.
Feiten: Microsoft heeft kwetsbaarheden verholpen in Exchange, zowel on-premise als online.
Interpretaties: Een kwaadwillende kan de kwetsbaarheden misbruiken om zich voor te doen als andere gebruiker en toegang te krijgen tot gevoelige gegevens. Ook kan de kwaadwillende mogelijk willekeurige code uitvoeren. De ernstigste kwetsbaarheid bevond zich in Exchange Online en heeft kenmerk CVE-2026-48579 toegewezen gekregen. Deze kwetsbaarheid is reeds centraal verholpen door Microsoft en vereist geen verdere actie. De kwetsbaarheid is ter informatie opgenomen. ``` Microsoft Exchange Online: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2026-48579 | 9.10 | Toegang tot gevoelige gegevens | |----------------|------|-------------------------------------| Microsoft Exchange Server: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2026-45500 | 6.10 | Voordoen als andere gebruiker | | CVE-2026-45501 | 6.50 | Voordoen als andere gebruiker | | CVE-2026-45502 | 5.00 | Toegang tot gevoelige gegevens | | CVE-2026-45503 | 8.10 | Toegang tot gevoelige gegevens | | CVE-2026-45504 | 8.80 | Verkrijgen van verhoogde rechten | | CVE-2026-45583 | 7.50 | Uitvoeren van willekeurige code | | CVE-2026-47631 | 8.10 | Voordoen als andere gebruiker | |----------------|------|-------------------------------------| ```
Oplossingen: Microsoft heeft updates beschikbaar gesteld waarmee de beschreven kwetsbaarheden worden verholpen. We raden u aan om deze updates te installeren. Meer informatie over de kwetsbaarheden, de installatie van de updates en eventuele work-arounds vindt u op: https://portal.msrc.microsoft.com/en-us/security-guidance
Kans: medium
Schade: high
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-94: Improper Control of Generation of Code ('Code Injection')
CWE-285: Improper Authorization
CWE-918: Server-Side Request Forgery (SSRF)
CVE-2026-45500

A cross-site scripting vulnerability in Microsoft Exchange Server allows unauthorized attackers to perform network-based spoofing by improperly neutralizing input during web page generation.

6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected products
Product Identifier Version Remediation
vers:unknown/*
Microsoft / Exchange
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Online
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server 2016 Cumulative Update 23
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server 2019 Cumulative Update 14
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server 2019 Cumulative Update 15
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server Subscription Edition RTM
 vers:unknown/*
CVE-2026-45501

Microsoft Exchange Server contains SSRF and XSS vulnerabilities that allow authorized and unauthorized attackers to perform network spoofing due to improper input neutralization during web page generation.

6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CWE-918 - Server-Side Request Forgery (SSRF)
Affected products
Product Identifier Version Remediation
vers:unknown/*
Microsoft / Exchange
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Online
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server 2016 Cumulative Update 23
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server 2019 Cumulative Update 14
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server 2019 Cumulative Update 15
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server Subscription Edition RTM
 vers:unknown/*
CVE-2026-45502

A server-side request forgery (SSRF) vulnerability in Microsoft Exchange Server allows an authorized attacker to disclose sensitive information over a network.

5.0 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
CWE-918 - Server-Side Request Forgery (SSRF)
Affected products
Product Identifier Version Remediation
vers:unknown/*
Microsoft / Exchange
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Online
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server 2016 Cumulative Update 23
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server 2019 Cumulative Update 14
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server 2019 Cumulative Update 15
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server Subscription Edition RTM
 vers:unknown/*
CVE-2026-45503

Multiple vulnerabilities in Microsoft Exchange Server, including improper authorization and server-side request forgery (SSRF), allow authorized attackers to disclose sensitive information over a network.

8.1 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Affected products
Product Identifier Version Remediation
vers:unknown/*
Microsoft / Exchange
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Online
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server 2016 Cumulative Update 23
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server 2019 Cumulative Update 14
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server 2019 Cumulative Update 15
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server Subscription Edition RTM
 vers:unknown/*
CVE-2026-45504

A server-side request forgery (SSRF) vulnerability in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network, potentially compromising system security.

8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-918 - Server-Side Request Forgery (SSRF)
Affected products
Product Identifier Version Remediation
vers:unknown/*
Microsoft / Exchange
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Online
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server 2016 Cumulative Update 23
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server 2019 Cumulative Update 14
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server 2019 Cumulative Update 15
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server Subscription Edition RTM
 vers:unknown/*
CVE-2026-45583

A code injection vulnerability in Microsoft Exchange Server allows unauthorized remote attackers to execute arbitrary code over a network.

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-94 - Improper Control of Generation of Code ('Code Injection')
Affected products
Product Identifier Version Remediation
vers:unknown/*
Microsoft / Exchange
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Online
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server 2016 Cumulative Update 23
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server 2019 Cumulative Update 14
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server 2019 Cumulative Update 15
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server Subscription Edition RTM
 vers:unknown/*
CVE-2026-47631

A cross-site scripting vulnerability in Microsoft Exchange Server allows unauthorized attackers to perform network-based spoofing by improperly neutralizing input during web page generation.

8.1 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C
CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected products
Product Identifier Version Remediation
vers:unknown/*
Microsoft / Exchange
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Online
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server 2016 Cumulative Update 23
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server 2019 Cumulative Update 14
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server 2019 Cumulative Update 15
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server Subscription Edition RTM
 vers:unknown/*
CVE-2026-48579

An improper authorization vulnerability in Microsoft Exchange Online enables unauthorized attackers to disclose sensitive information over a network.

9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C
Affected products
Product Identifier Version Remediation
vers:unknown/*
Microsoft / Exchange
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Online
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server 2016 Cumulative Update 23
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server 2019 Cumulative Update 14
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server 2019 Cumulative Update 15
 vers:unknown/*
vers:unknown/*
Microsoft / Microsoft Exchange Server Subscription Edition RTM
 vers:unknown/*
References
To clipboard 

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        "text": "Microsoft heeft kwetsbaarheden verholpen in Exchange, zowel on-premise als online.",
        "title": "Feiten"
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        "text": "Een kwaadwillende kan de kwetsbaarheden misbruiken om zich voor te doen als andere gebruiker en toegang te krijgen tot gevoelige gegevens. Ook kan de kwaadwillende mogelijk willekeurige code uitvoeren.\n\nDe ernstigste kwetsbaarheid bevond zich in Exchange Online en heeft kenmerk CVE-2026-48579 toegewezen gekregen. Deze kwetsbaarheid is reeds centraal verholpen door Microsoft en vereist geen verdere actie. De kwetsbaarheid is ter informatie opgenomen.\n\n```\nMicrosoft Exchange Online: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-48579 | 9.10 | Toegang tot gevoelige gegevens      | \n|----------------|------|-------------------------------------|\n\nMicrosoft Exchange Server: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-45500 | 6.10 | Voordoen als andere gebruiker       | \n| CVE-2026-45501 | 6.50 | Voordoen als andere gebruiker       | \n| CVE-2026-45502 | 5.00 | Toegang tot gevoelige gegevens      | \n| CVE-2026-45503 | 8.10 | Toegang tot gevoelige gegevens      | \n| CVE-2026-45504 | 8.80 | Verkrijgen van verhoogde rechten    | \n| CVE-2026-45583 | 7.50 | Uitvoeren van willekeurige code     | \n| CVE-2026-47631 | 8.10 | Voordoen als andere gebruiker       | \n|----------------|------|-------------------------------------|\n```",
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        "name": "Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)"
      },
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          "text": "Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
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          "category": "description",
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        }
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      "title": "CVE-2026-45500"
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          "text": "Server-Side Request Forgery (SSRF)",
          "title": "CWE-918"
        },
        {
          "category": "description",
          "text": "Microsoft Exchange Server contains SSRF and XSS vulnerabilities that allow authorized and unauthorized attackers to perform network spoofing due to improper input neutralization during web page generation.",
          "title": "Summary"
        }
      ],
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          "CSAFPID-6"
        ]
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          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-45501.json"
        }
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          "text": "Server-Side Request Forgery (SSRF)",
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        {
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          "title": "Summary"
        }
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          "CSAFPID-6"
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          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-45502.json"
        }
      ],
      "scores": [
        {
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            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N",
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            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6"
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      "title": "CVE-2026-45502"
    },
    {
      "cve": "CVE-2026-45503",
      "notes": [
        {
          "category": "description",
          "text": "Multiple vulnerabilities in Microsoft Exchange Server, including improper authorization and server-side request forgery (SSRF), allow authorized attackers to disclose sensitive information over a network.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
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          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-45503 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-45503.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6"
          ]
        }
      ],
      "title": "CVE-2026-45503"
    },
    {
      "cve": "CVE-2026-45504",
      "cwe": {
        "id": "CWE-918",
        "name": "Server-Side Request Forgery (SSRF)"
      },
      "notes": [
        {
          "category": "other",
          "text": "Server-Side Request Forgery (SSRF)",
          "title": "CWE-918"
        },
        {
          "category": "description",
          "text": "A server-side request forgery (SSRF) vulnerability in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network, potentially compromising system security.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-45504 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-45504.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6"
          ]
        }
      ],
      "title": "CVE-2026-45504"
    },
    {
      "cve": "CVE-2026-45583",
      "cwe": {
        "id": "CWE-94",
        "name": "Improper Control of Generation of Code (\u0027Code Injection\u0027)"
      },
      "notes": [
        {
          "category": "other",
          "text": "Improper Control of Generation of Code (\u0027Code Injection\u0027)",
          "title": "CWE-94"
        },
        {
          "category": "description",
          "text": "A code injection vulnerability in Microsoft Exchange Server allows unauthorized remote attackers to execute arbitrary code over a network.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-45583 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-45583.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6"
          ]
        }
      ],
      "title": "CVE-2026-45583"
    },
    {
      "cve": "CVE-2026-47631",
      "cwe": {
        "id": "CWE-79",
        "name": "Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)"
      },
      "notes": [
        {
          "category": "other",
          "text": "Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
          "title": "CWE-79"
        },
        {
          "category": "description",
          "text": "A cross-site scripting vulnerability in Microsoft Exchange Server allows unauthorized attackers to perform network-based spoofing by improperly neutralizing input during web page generation.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-47631 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-47631.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6"
          ]
        }
      ],
      "title": "CVE-2026-47631"
    },
    {
      "cve": "CVE-2026-48579",
      "notes": [
        {
          "category": "description",
          "text": "An improper authorization vulnerability in Microsoft Exchange Online enables unauthorized attackers to disclose sensitive information over a network.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-48579 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-48579.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6"
          ]
        }
      ],
      "title": "CVE-2026-48579"
    }
  ]
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.