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Fencer Vulns
high 8.0

CVE-2026-27099 json

Jenkins has a stored XSS vulnerability in node offline cause description

published 2026-02-18 8 mo ago modified 2026-09-10 59 d ago also BIT-jenkins-2026-27099 , EUVD-2026-8091 , GHSA-85h6-5m3v-gx37

cvss
8.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 41%
public exploits
0
none known

Summary

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.

Patch / fix

  • maven org.jenkins-ci.main:jenkins-core 2.541.2, 2.551
  • bitnami jenkins 2.541.2, 2.551.0
  • Jenkins Project Jenkins 2.551

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-27099 updated cvss 4.6

org.jenkins-ci.main/jenkins-core: Jenkins: Stored Cross-site Scripting (XSS) via unescaped user-provided offline cause description

  • Red Hat OpenShift Developer Tools and Services jenkins
    affected: no fix available “Fix deferred”
  • Red Hat OpenShift Developer Tools and Services 4.12 ocp-tools-4 1776764096
    fixed: vendor fix RHSA-2026:10209
  • Red Hat OpenShift Developer Tools and Services 4.13 ocp-tools-4 1776764096
    fixed: vendor fix RHSA-2026:10201
  • Red Hat OpenShift Developer Tools and Services 4.14 ocp-tools-4 1776762347
    fixed: vendor fix RHSA-2026:10211
  • Red Hat OpenShift Developer Tools and Services 4.15 ocp-tools-4 1776762347
    fixed: vendor fix RHSA-2026:10204
  • Red Hat OpenShift Developer Tools and Services 4.16 ocp-tools-4 1776944215
    fixed: vendor fix RHSA-2026:10214
  • Red Hat OpenShift Developer Tools and Services 4.17 ocp-tools-4 1776944215
    fixed: vendor fix RHSA-2026:10213
  • Red Hat OpenShift Developer Tools and Services 4.18 ocp-tools-4 1776944215
    fixed: vendor fix RHSA-2026:10215
show 4 more
  • Red Hat OpenShift Developer Tools and Services 4.19 ocp-tools-4 1776944215
    fixed: vendor fix RHSA-2026:10206
  • Red Hat OpenShift Developer Tools and Services 4.20 ocp-tools-4 1776944215
    fixed: vendor fix RHSA-2026:10205
  • Red Hat OpenShift Developer Tools and Services 4.21 ocp-tools-4 1776944215
    fixed: vendor fix RHSA-2026:10199
  • Red Hat OpenShift Developer Tools and Services 4.12 ocp-tools-4 1776760341 Red Hat OpenShift Developer Tools and Services 4.13 ocp-tools-4 1776760341 Red Hat OpenShift Developer Tools and Services 4.14 ocp-tools-4 1776760341 Red Hat OpenShift Developer Tools and Services 4.15 ocp-tools-4 1776760341 Red Hat OpenShift Developer Tools and Services 4.16 ocp-tools-4 1776944183 Red Hat OpenShift Developer Tools and Services 4.17 ocp-tools-4 1776944183
    +4 more products
    Red Hat OpenShift Developer Tools and Services 4.18 ocp-tools-4 1776944183 Red Hat OpenShift Developer Tools and Services 4.19 ocp-tools-4 1776944183 Red Hat OpenShift Developer Tools and Services 4.20 ocp-tools-4 1776944183 Red Hat OpenShift Developer Tools and Services 4.21 ocp-tools-4 1776944183
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
8 mo ago

Exploit prediction

0.48% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 8.0 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
GitHub 3.1 8.0 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
CNA 3.1 8.0 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
OSV 3.1 8.0 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
maven org.jenkins-ci.main:jenkins-core
>=2.542, <2.551
>=2.483, <2.541.2
2.551
2.541.2
bitnami jenkins
>=2.483.0, <2.541.2
>=2.542.0, <2.551.0
2.541.2
2.551.0

Affected products

  • Jenkins Project Jenkins

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.