CVE-2026-27099
High
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.
SeverityHigh
CVSS8.0
Exploit probability—
Product
Jenkins
PublishedFeb 18, 2026
First seenFeb 18, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- jenkins jenkins2.551, 2.541.2 or later
- org.jenkins-ci.main:jenkins-core2.551, 2.541.2 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| jenkins jenkins | 2.483 ≤ v < 2.551, 2.492.1 ≤ v < 2.541.2 | 2.551, 2.541.2 |
| org.jenkins-ci.main:jenkins-coreMaven | 2.542 ≤ v < 2.551, 2.483 ≤ v < 2.541.2 | 2.551, 2.541.2 |
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