What’s Vulnerable › Vulnerabilities
CVE-2026-27099
- Severity: high (CVSS 8.0 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-02-18 · updated 2026-06-17
- Weakness: CWE-79
Description
Jenkins 2.483 through 2.550 (both inclusive), LTS 2.492.1 through 2.541.1 (both inclusive) does not escape the user-provided description of the "Mark temporarily offline" offline cause, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Agent/Configure or Agent/Disconnect permission.
Affected products
- Jenkins: from 2.483 before 2.551; from 2.492.1 before 2.541.2 — fixed in 2.541.2, 2.551
How to fix
Upgrade to a fixed version: Jenkins 2.541.2, 2.551. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2026-27099 or the next vulnerability affects your stack