NCSC-2026-0265

Vulnerability from csaf_ncscnl - Published: 2026-07-27 10:38 - Updated: 2026-07-27 10:38
Summary
Kwetsbaarheden verholpen in SolarWinds Serv-U
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: SolarWinds heeft meerdere kwetsbaarheden verholpen in Serv-U.
Interpretaties: De kwetsbaarheden in SolarWinds Serv-U betreffen voornamelijk insecure direct object reference (IDOR) en broken access control. Deze maken het mogelijk voor aanvallers met bepaalde privileges, zoals domain administrator of group administrator toegang, om privileges te escaleren naar system administrator of root-niveau. Hierdoor kunnen zij op afstand willekeurige code uitvoeren en systeembeheerrechten verkrijgen. Sommige kwetsbaarheden maken het ook mogelijk om SMTP-sessies te kapen, accounts over te nemen, of persistent cross-site scripting (XSS) uit te voeren die sessies van beheerders kan compromitteren. De impact van deze kwetsbaarheden is op Windows-omgevingen doorgaans minder groot dan op andere platformen. Exploitatie vereist meestal dat de aanvaller al beschikt over geauthenticeerde toegang met hoge privileges, zoals domain administrator rechten. De verholpen kwetsbaarheden betreffen zoals gezegd overwegend kwetsbaarheden die kunnen worden misbruikt in zo genaamde 'Evil Admin'-scenario's. Dit soort kwetsbaarheden zijn doorgaans niet eenvoudig te misbruiken door ongeathenticeerde kwaadwillenden op afstand. Echter zijn er in deze updates dermate veel verholpen dat het aan te raden is om, naast het inzetten van de updates, te controleren hoe de rechtenstructuur is geïmplementeerd. Dit geldt voornamelijk voor onderdelen die publiek toegankelijk zijn.
Oplossingen: SolarWinds heeft updates uitgebracht om de kwetsbaarheden in Serv-U te verhelpen. Zie bijgevoegde referenties voor meer informatie.
Kans: medium
Schade: high
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-284: Improper Access Control
CWE-285: Improper Authorization
CWE-639: Authorization Bypass Through User-Controlled Key
CWE-862: Missing Authorization
CVE-2026-28302

SolarWinds Serv-U contains an insecure direct object reference (IDOR) vulnerability enabling privilege escalation and remote code execution as root, primarily requiring group administrator access, with reduced impact on Windows systems.

9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CWE-639 - Authorization Bypass Through User-Controlled Key
Affected products
Product Identifier Version Remediation
vers:unknown/*
SolarWinds / Serv-U
 vers:unknown/*
CVE-2026-28304

SolarWinds Serv-U contains a remote code execution vulnerability enabling arbitrary code execution with root privileges remotely, with a comparatively lower impact on Windows deployments.

9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Affected products
Product Identifier Version Remediation
vers:unknown/*
SolarWinds / Serv-U
 vers:unknown/*
CVE-2026-28305

SolarWinds Serv-U contains an insecure direct object reference (IDOR) vulnerability enabling remote code execution as root, requiring domain admin read/write access, with reduced impact on Windows deployments.

9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CWE-639 - Authorization Bypass Through User-Controlled Key
Affected products
Product Identifier Version Remediation
vers:unknown/*
SolarWinds / Serv-U
 vers:unknown/*
CVE-2026-28306

SolarWinds Serv-U contains a privilege escalation vulnerability that allows a domain administrator to elevate privileges to system administrator, with a comparatively lower impact on Windows deployments.

9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Affected products
Product Identifier Version Remediation
vers:unknown/*
SolarWinds / Serv-U
 vers:unknown/*
CVE-2026-28307

SolarWinds Serv-U contains a privilege escalation vulnerability allowing a domain user group to be elevated to an administrator group, with a reduced impact on Windows deployments.

9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Affected products
Product Identifier Version Remediation
vers:unknown/*
SolarWinds / Serv-U
 vers:unknown/*
CVE-2026-28308

SolarWinds Serv-U contains an IDOR vulnerability that allows remote code execution requiring domain administrator privileges, with a lesser impact on Windows deployments.

9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CWE-639 - Authorization Bypass Through User-Controlled Key
Affected products
Product Identifier Version Remediation
vers:unknown/*
SolarWinds / Serv-U
 vers:unknown/*
CVE-2026-28309

SolarWinds Serv-U contains a broken access control vulnerability allowing a domain administrator to escalate privileges by creating system administrator accounts, with a notably reduced impact on Windows deployments.

9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CWE-862 - Missing Authorization
Affected products
Product Identifier Version Remediation
vers:unknown/*
SolarWinds / Serv-U
 vers:unknown/*
CVE-2026-28310

SolarWinds Serv-U contains a privilege escalation vulnerability that allows a domain administrator to elevate privileges to system administrator, with a reduced impact on Windows deployments.

9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CWE-862 - Missing Authorization
Affected products
Product Identifier Version Remediation
vers:unknown/*
SolarWinds / Serv-U
 vers:unknown/*
CVE-2026-28312

SolarWinds Serv-U contains a privilege escalation vulnerability enabling system administrator access and root code execution, with reduced impact on Windows deployments.

9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Affected products
Product Identifier Version Remediation
vers:unknown/*
SolarWinds / Serv-U
 vers:unknown/*
CVE-2026-28313

SolarWinds Serv-U contains an insecure direct object reference (IDOR) vulnerability that enables SMTP hijacking and arbitrary account takeover, with a comparatively lower impact on Windows deployments.

9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CWE-639 - Authorization Bypass Through User-Controlled Key
Affected products
Product Identifier Version Remediation
vers:unknown/*
SolarWinds / Serv-U
 vers:unknown/*
CVE-2026-28314

SolarWinds Serv-U contains an insecure direct object reference vulnerability that can lead to account takeover, requiring user authentication, with a reduced impact on Windows deployments.

9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CWE-639 - Authorization Bypass Through User-Controlled Key
Affected products
Product Identifier Version Remediation
vers:unknown/*
SolarWinds / Serv-U
 vers:unknown/*
CVE-2026-28315

SolarWinds Serv-U contains a stored cross-site scripting vulnerability that may enable session hijacking or information disclosure from administrator accounts.

6.2 (Medium)
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:N/A:N
CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected products
Product Identifier Version Remediation
vers:unknown/*
SolarWinds / Serv-U
 vers:unknown/*
CVE-2026-28316

SolarWinds Serv-U contains an IDOR vulnerability enabling privilege escalation to system administrator with root command execution, requiring a domain account with admin access, with reduced impact on Windows deployments.

9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CWE-639 - Authorization Bypass Through User-Controlled Key
Affected products
Product Identifier Version Remediation
vers:unknown/*
SolarWinds / Serv-U
 vers:unknown/*
CVE-2026-28317

SolarWinds Serv-U contains an insecure direct object reference (IDOR) vulnerability that enables privilege escalation, requiring domain administrator access, with a comparatively lower impact on Windows deployments.

9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CWE-639 - Authorization Bypass Through User-Controlled Key
Affected products
Product Identifier Version Remediation
vers:unknown/*
SolarWinds / Serv-U
 vers:unknown/*
CVE-2026-28321

SolarWinds Serv-U contains a broken access control vulnerability enabling domain administrators to read and write arbitrary files, potentially leading to privilege escalation and root code execution, with reduced impact on Windows systems.

9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Affected products
Product Identifier Version Remediation
vers:unknown/*
SolarWinds / Serv-U
 vers:unknown/*
References
To clipboard 

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      "cwe": {
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        "name": "Missing Authorization"
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          "category": "other",
          "text": "Missing Authorization",
          "title": "CWE-862"
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          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-28309.json"
        }
      ],
      "scores": [
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            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
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      ],
      "title": "CVE-2026-28309"
    },
    {
      "cve": "CVE-2026-28310",
      "cwe": {
        "id": "CWE-862",
        "name": "Missing Authorization"
      },
      "notes": [
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          "category": "other",
          "text": "Missing Authorization",
          "title": "CWE-862"
        },
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          "text": "SolarWinds Serv-U contains a privilege escalation vulnerability that allows a domain administrator to elevate privileges to system administrator, with a reduced impact on Windows deployments.",
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      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-28310 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-28310.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1"
          ]
        }
      ],
      "title": "CVE-2026-28310"
    },
    {
      "cve": "CVE-2026-28312",
      "notes": [
        {
          "category": "description",
          "text": "SolarWinds Serv-U contains a privilege escalation vulnerability enabling system administrator access and root code execution, with reduced impact on Windows deployments.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-28312 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-28312.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1"
          ]
        }
      ],
      "title": "CVE-2026-28312"
    },
    {
      "cve": "CVE-2026-28313",
      "cwe": {
        "id": "CWE-639",
        "name": "Authorization Bypass Through User-Controlled Key"
      },
      "notes": [
        {
          "category": "other",
          "text": "Authorization Bypass Through User-Controlled Key",
          "title": "CWE-639"
        },
        {
          "category": "description",
          "text": "SolarWinds Serv-U contains an insecure direct object reference (IDOR) vulnerability that enables SMTP hijacking and arbitrary account takeover, with a comparatively lower impact on Windows deployments.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-28313 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-28313.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1"
          ]
        }
      ],
      "title": "CVE-2026-28313"
    },
    {
      "cve": "CVE-2026-28314",
      "cwe": {
        "id": "CWE-639",
        "name": "Authorization Bypass Through User-Controlled Key"
      },
      "notes": [
        {
          "category": "other",
          "text": "Authorization Bypass Through User-Controlled Key",
          "title": "CWE-639"
        },
        {
          "category": "description",
          "text": "SolarWinds Serv-U contains an insecure direct object reference vulnerability that can lead to account takeover, requiring user authentication, with a reduced impact on Windows deployments.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-28314 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-28314.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1"
          ]
        }
      ],
      "title": "CVE-2026-28314"
    },
    {
      "cve": "CVE-2026-28315",
      "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": "SolarWinds Serv-U contains a stored cross-site scripting vulnerability that may enable session hijacking or information disclosure from administrator accounts.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-28315 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-28315.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.2,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:N/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1"
          ]
        }
      ],
      "title": "CVE-2026-28315"
    },
    {
      "cve": "CVE-2026-28316",
      "cwe": {
        "id": "CWE-639",
        "name": "Authorization Bypass Through User-Controlled Key"
      },
      "notes": [
        {
          "category": "other",
          "text": "Authorization Bypass Through User-Controlled Key",
          "title": "CWE-639"
        },
        {
          "category": "description",
          "text": "SolarWinds Serv-U contains an IDOR vulnerability enabling privilege escalation to system administrator with root command execution, requiring a domain account with admin access, with reduced impact on Windows deployments.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-28316 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-28316.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1"
          ]
        }
      ],
      "title": "CVE-2026-28316"
    },
    {
      "cve": "CVE-2026-28317",
      "cwe": {
        "id": "CWE-639",
        "name": "Authorization Bypass Through User-Controlled Key"
      },
      "notes": [
        {
          "category": "other",
          "text": "Authorization Bypass Through User-Controlled Key",
          "title": "CWE-639"
        },
        {
          "category": "description",
          "text": "SolarWinds Serv-U contains an insecure direct object reference (IDOR) vulnerability that enables privilege escalation, requiring domain administrator access, with a comparatively lower impact on Windows deployments.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-28317 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-28317.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1"
          ]
        }
      ],
      "title": "CVE-2026-28317"
    },
    {
      "cve": "CVE-2026-28321",
      "notes": [
        {
          "category": "description",
          "text": "SolarWinds Serv-U contains a broken access control vulnerability enabling domain administrators to read and write arbitrary files, potentially leading to privilege escalation and root code execution, with reduced impact on Windows systems.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-28321 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-28321.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1"
          ]
        }
      ],
      "title": "CVE-2026-28321"
    }
  ]
}



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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.