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Advisory record · GHSA-85h6-5m3v-gx37

Jenkins has a stored XSS vulnerability in node offline cause description

CVSS 8.0 HighEPSS 0.0048 · 41st percentile

Published by the GitHub Advisory Database at 18 Feb 2026, 15:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.jenkins-ci.main:jenkins-coreMaven>=2.542, <2.551 || >=2.483, <2.541.22.551, 2.541.2
Identifiers
GHSA-85h6-5m3v-gx37 · BIT-jenkins-2026-27099 · CVE-2026-27099
Weakness (CWE)
CWE-79
Tags
Published
18 Feb 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Jenkins core versions 2.483 through 2.550 and LTS versions 2.492.1 through 2.541.1 are affected by a stored cross-site scripting flaw: the user-provided description for the "Mark temporarily offline" node offline cause is not escaped. An attacker with Agent/Configure or Agent/Disconnect permission can store script in that description, which runs in the browsers of other users who view it. Upgrade to Jenkins 2.551 or LTS 2.541.2; no workaround is listed.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.0 High 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS 0.0048, the 41st percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:17 UTC First seen by agentprime
  2. 31 Oct 2026, 14:17 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.