Stored XSS Vulnerability in Jenkins Affecting Multiple Versions
CVE-2026-27099

8HIGH

Key Information:

Vendor

Jenkins
Status
Jenkins
Vendor
CVE Published:
18 February 2026

What is CVE-2026-27099?

A stored cross-site scripting (XSS) vulnerability exists in Jenkins versions 2.483 to 2.550 and LTS versions 2.492.1 to 2.541.1. The flaw is due to improper escaping of user-provided input in the 'Mark temporarily offline' cause description. Attackers with Agent/Configure or Agent/Disconnect permissions can exploit this vulnerability to execute malicious scripts, potentially compromising user sessions and sensitive data.

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Deploy the Patch

Affected Version(s)

Jenkins 0

Jenkins 0 < 2.483

Jenkins 2.551

References

https://www.jenkins.io/security/advisory/2026-02-18/#SECU...
vendor-advisory

CVSS V3.1

Score:
8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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