CVE-2026-27099
Jenkins has a stored XSS vulnerability in node offline cause description
8.0
HIGH
CVSS 3.1
EPSS 0.07%
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.
How to fix CVE-2026-27099
To remediate CVE-2026-27099, upgrade the affected package to a fixed version below.
- —upgrade to 2.541.2 or later
- —upgrade to 2.551 or later
Is CVE-2026-27099 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- >= 2.483.0, < 2.541.2, >= 2.542.0, < 2.551.0
- >= 2.542, < 2.551
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.0 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H |