NCSC-2026-0289

Vulnerability from csaf_ncscnl - Published: 2026-08-12 05:43 - Updated: 2026-08-28 11:33
Summary
Kwetsbaarheden verholpen in Microsoft Exchange server
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 Server.
Interpretaties: Een kwaadwillende kan de kwetsbaarheden misbruiken om een Denial-of-Service uit te voeren, zich voor te doen als andere gebruiker, zich verhoogde rechten toe te kennen, willekeurige code uit te voeren en/of toegang te krijgen tot gevoelige gegevens. **Update**: Voor de kwetsbaarheid met kenmerk CVE-2026-62911 is proof-of-concept-code gepubliceerd. Deze kwetsbaarheid stelt een ongeauthenticeerde kwaadwillende in staat om willekeurige code uit te voeren. Zodoende krijgt de kwaadwillende bijvoorbeeld toegang tot mailboxen van Exchange-gebruikers, en kan de kwetsbaarheid worden misbruikt voor het uitvoeren van verdere aanvallen op het netwerk van het slachtoffer.
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 Houd er rekening mee dat Exchange Server 2016 en 2019 end-of-life zijn en enkel via het ESU-programma nog beveiligingsupdates ontvangen. Het NCSC adviseert met klem om Exchange Servers die geen ESU-ondersteuning ontvangen, alleen vanaf interne netwerken benaderbaar te maken en waar mogelijk uit te faseren.
Kans: high
Schade: high
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-99: Improper Control of Resource Identifiers ('Resource Injection')
CWE-122: Heap-based Buffer Overflow
CWE-294: Authentication Bypass by Capture-replay
CWE-502: Deserialization of Untrusted Data
CWE-862: Missing Authorization
CWE-918: Server-Side Request Forgery (SSRF)
CVE-2026-62910

An improper control of resource identifiers vulnerability in Microsoft Exchange Server enables an authorized attacker to elevate privileges over a network.

7.2 (High)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CWE-99 - Improper Control of Resource Identifiers ('Resource Injection')
Affected products
Product Identifier Version Remediation
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-2026-62912

A deserialization vulnerability in Microsoft Exchange Server allows an authorized attacker to cause a denial of service over a network by processing untrusted data.

6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-502 - Deserialization of Untrusted Data
Affected products
Product Identifier Version Remediation
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-2026-62913

A heap-based buffer overflow vulnerability in Microsoft Exchange Server enables an authorized attacker to execute arbitrary code remotely over a network.

8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-122 - Heap-based Buffer Overflow
Affected products
Product Identifier Version Remediation
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-2026-62914

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

7.3 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected products
Product Identifier Version Remediation
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-2026-62915

A missing authorization vulnerability in Microsoft Exchange Server enables an authorized attacker to bypass a security feature over a network, potentially compromising system integrity.

6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
CWE-862 - Missing Authorization
Affected products
Product Identifier Version Remediation
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-2026-65813

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.

6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
CWE-918 - Server-Side Request Forgery (SSRF)
Affected products
Product Identifier Version Remediation
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-2026-62911

An authentication bypass vulnerability via capture-replay in Microsoft Exchange Server enables an authorized attacker to elevate privileges over a network.

8.0 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
CWE-294 - Authentication Bypass by Capture-replay
Affected products
Product Identifier Version Remediation
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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      },
      {
        "category": "description",
        "text": "Microsoft heeft kwetsbaarheden verholpen in Exchange Server.",
        "title": "Feiten"
      },
      {
        "category": "description",
        "text": "Een kwaadwillende kan de kwetsbaarheden misbruiken om een Denial-of-Service uit te voeren, zich voor te doen als andere gebruiker, zich verhoogde rechten toe te kennen, willekeurige code uit te voeren en/of toegang te krijgen tot gevoelige gegevens.\n\n**Update**: Voor de kwetsbaarheid met kenmerk CVE-2026-62911 is proof-of-concept-code gepubliceerd. Deze kwetsbaarheid stelt een ongeauthenticeerde kwaadwillende in staat om willekeurige code uit te voeren. Zodoende krijgt de kwaadwillende bijvoorbeeld toegang tot mailboxen van Exchange-gebruikers, en kan de kwetsbaarheid worden misbruikt voor het uitvoeren van verdere aanvallen op het netwerk van het slachtoffer.",
        "title": "Interpretaties"
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        "text": "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:\n\nhttps://portal.msrc.microsoft.com/en-us/security-guidance\n\nHoud er rekening mee dat Exchange Server 2016 en 2019 end-of-life zijn en enkel via het ESU-programma nog beveiligingsupdates ontvangen. Het NCSC adviseert met klem om Exchange Servers die geen ESU-ondersteuning ontvangen, alleen vanaf interne netwerken benaderbaar te maken en waar mogelijk uit te faseren.",
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    "title": "Kwetsbaarheden verholpen in Microsoft Exchange server",
    "tracking": {
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        }
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          "title": "Summary"
        }
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        }
      ],
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        {
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            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4"
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      "title": "CVE-2026-62913"
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        "name": "Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)"
      },
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        {
          "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 authorized attackers to perform network-based spoofing by improper input neutralization during web page generation.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
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          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-62914 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-62914.json"
        }
      ],
      "scores": [
        {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N",
            "version": "3.1"
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          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4"
          ]
        }
      ],
      "title": "CVE-2026-62914"
    },
    {
      "cve": "CVE-2026-62915",
      "cwe": {
        "id": "CWE-862",
        "name": "Missing Authorization"
      },
      "notes": [
        {
          "category": "other",
          "text": "Missing Authorization",
          "title": "CWE-862"
        },
        {
          "category": "description",
          "text": "A missing authorization vulnerability in Microsoft Exchange Server enables an authorized attacker to bypass a security feature over a network, potentially compromising system integrity.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-62915 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-62915.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4"
          ]
        }
      ],
      "title": "CVE-2026-62915"
    },
    {
      "cve": "CVE-2026-65813",
      "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": [
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          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-65813 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-65813.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4"
          ]
        }
      ],
      "title": "CVE-2026-65813"
    },
    {
      "cve": "CVE-2026-62911",
      "cwe": {
        "id": "CWE-294",
        "name": "Authentication Bypass by Capture-replay"
      },
      "notes": [
        {
          "category": "other",
          "text": "Authentication Bypass by Capture-replay",
          "title": "CWE-294"
        },
        {
          "category": "description",
          "text": "An authentication bypass vulnerability via capture-replay in Microsoft Exchange Server enables an authorized attacker to elevate privileges over a network.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-62911 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-62911.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 8.0,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4"
          ]
        }
      ],
      "title": "CVE-2026-62911"
    }
  ]
}



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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.