Jenkins 2.483-2.550 Stored XSS via Offline Cause
CVE-2026-27099 Published on February 18, 2026
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.
Vulnerability Analysis
CVE-2026-27099 can be exploited with network access, requires user interaction and a small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
What is a XSS Vulnerability?
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
CVE-2026-27099 has been classified to as a XSS vulnerability or weakness.
Products Associated with CVE-2026-27099
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Affected Versions
Jenkins Project Jenkins:- Before 2.483 is unaffected.
- Version 2.551 and below * is unaffected.
- Version 2.541.2 and below 2.541.* is unaffected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.