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TI-2026-21558 Aliases CVE-2026-27099GHSA-85h6-5m3v-gx37

Cross-site scripting in Jenkins

Priority LOW 37CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 10 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-79.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00481 41st percentileScored 2026-11-07
Fix Partial Jenkins (Jenkins Project): 2.551, 2.541.2org.jenkins-ci.main:jenkins-core (Maven): 2.551, 2.541.2Red Hat: 10 advisoriesRed Hat: 10 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
JenkinsJenkins—2.551, 2.541.2Patch availableCNA
—org.jenkins-ci.main:jenkins-core (Maven)2.542 to before 2.5512.551Patch availableGHSA-85h6-5m3v-gx37
—org.jenkins-ci.main:jenkins-core (Maven)2.483 to before 2.541.22.541.2Patch availableGHSA-85h6-5m3v-gx37
  • Jenkins VendorJenkins Affected — Fixed in 2.551, 2.541.2 Patch available CNA
  • org.jenkins-ci.main:jenkins-core (Maven) Vendor— Affected 2.542 to before 2.551 Fixed in 2.551 Patch available GHSA-85h6-5m3v-gx37
  • org.jenkins-ci.main:jenkins-core (Maven) Vendor— Affected 2.483 to before 2.541.2 Fixed in 2.541.2 Patch available GHSA-85h6-5m3v-gx37

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:jenkins:jenkins:*:*:*:*:-:*:*:*2.483 to before 2.551VulnerableJenkins
cpe:2.3:a:jenkins:jenkins:*:*:*:*:lts:*:*:*2.492.1 to before 2.541.2VulnerableJenkins
  • cpe:2.3:a:jenkins:jenkins:*:*:*:*:-:*:*:* Versions 2.483 to before 2.551 Vulnerable ·Jenkins
  • cpe:2.3:a:jenkins:jenkins:*:*:*:*:lts:*:*:* Versions 2.492.1 to before 2.541.2 Vulnerable ·Jenkins

Remediation

  • Fix · CNA Jenkins (Jenkins Project) Fixed in 2.551, 2.541.2
  • Fix · GHSA-85h6-5m3v-gx37 org.jenkins-ci.main:jenkins-core (Maven) Fixed in 2.551 Advisory →
  • Fix · GHSA-85h6-5m3v-gx37 org.jenkins-ci.main:jenkins-core (Maven) Fixed in 2.541.2 Advisory →

Red Hat 10 advisories

  • RHSA-2026:10214 Released 2026-04-23 · Red Hat rating Important
    Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.16 security update.
    • OpenShift Developer Tools and Services 4.16 registry.redhat.io/ocp-tools-4/jenkins-rhel9
  • RHSA-2026:10215 Released 2026-04-23 · Red Hat rating Important
    Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.18 security update.
    • OpenShift Developer Tools and Services 4.18 registry.redhat.io/ocp-tools-4/jenkins-rhel9
  • RHSA-2026:10213 Released 2026-04-23 · Red Hat rating Important
    Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.17 security update.
    • OpenShift Developer Tools and Services 4.17 registry.redhat.io/ocp-tools-4/jenkins-rhel9
Show 7 more Red Hat advisories
  • RHSA-2026:10211 Released 2026-04-23 · Red Hat rating Important
    Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.14 security update.
    • OpenShift Developer Tools and Services 4.14 registry.redhat.io/ocp-tools-4/jenkins-rhel8
  • RHSA-2026:10209 Released 2026-04-23 · Red Hat rating Important
    Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.12 security update.
    • OpenShift Developer Tools and Services 4.12 registry.redhat.io/ocp-tools-4/jenkins-rhel8
  • RHSA-2026:10206 Released 2026-04-23 · Red Hat rating Important
    Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.19 security update.
    • OpenShift Developer Tools and Services 4.19 registry.redhat.io/ocp-tools-4/jenkins-rhel9
  • RHSA-2026:10205 Released 2026-04-23 · Red Hat rating Important
    Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.20 security update.
    • OpenShift Developer Tools and Services 4.20 registry.redhat.io/ocp-tools-4/jenkins-rhel9
  • RHSA-2026:10204 Released 2026-04-23 · Red Hat rating Important
    Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.15 security update.
    • OpenShift Developer Tools and Services 4.15 registry.redhat.io/ocp-tools-4/jenkins-rhel8
  • RHSA-2026:10201 Released 2026-04-23 · Red Hat rating Important
    Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.13 security update.
    • OpenShift Developer Tools and Services 4.13 registry.redhat.io/ocp-tools-4/jenkins-rhel8
  • RHSA-2026:10199 Released 2026-04-23 · Red Hat rating Important
    Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.21 security update.
    • OpenShift Developer Tools and Services 4.21 registry.redhat.io/ocp-tools-4/jenkins-rhel9

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Jenkins — Jenkins Security Advisory 2026-02-18

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    Show all 2 records → Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
OpenShift Developer Tools and ServicesAffectedNo fix yet: Fix deferred
OpenShift Developer Tools and Services 4.12Fixed RHSA-2026:10209
OpenShift Developer Tools and Services 4.13Fixed RHSA-2026:10201
OpenShift Developer Tools and Services 4.14Fixed RHSA-2026:10211
OpenShift Developer Tools and Services 4.15Fixed RHSA-2026:10204
OpenShift Developer Tools and Services 4.16Fixed RHSA-2026:10214
OpenShift Developer Tools and Services 4.17Fixed RHSA-2026:10213
OpenShift Developer Tools and Services 4.18Fixed RHSA-2026:10215
OpenShift Developer Tools and Services 4.19Fixed RHSA-2026:10206
OpenShift Developer Tools and Services 4.20Fixed RHSA-2026:10205
OpenShift Developer Tools and Services 4.21Fixed RHSA-2026:10199
Not affected: 10 products
  • OpenShift Developer Tools and Services 4.12
  • OpenShift Developer Tools and Services 4.13
  • OpenShift Developer Tools and Services 4.14
  • OpenShift Developer Tools and Services 4.15
  • OpenShift Developer Tools and Services 4.16
  • OpenShift Developer Tools and Services 4.17
  • OpenShift Developer Tools and Services 4.18
  • OpenShift Developer Tools and Services 4.19
  • OpenShift Developer Tools and Services 4.20
  • OpenShift Developer Tools and Services 4.21

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-27099
  2. 2026-10-03 Alias added: GHSA-85h6-5m3v-gx37
  3. 2026-10-16 EPSS moved to the 50th–90th percentile
  4. 2026-10-25 EPSS moved to the below the 50th percentile

References

Advisory 2

Other 4

  • TI-2024-15885 Path traversal in Jenkins KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-16080 A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153… KEVCVSS 3.1CRITICAL 9.8
  • TI-2017-14573 Jenkins versions 2.56 and earlier as well as 2.46.1 LTS and earlier are vulnerable to an… KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2015-04472 The Fingerprints pages in Jenkins before 1.638 and LTS before 1.625.2 might allow remote… KEVCVSS 3.1HIGH 7.5
  • TI-2016-07596 The remoting module in Jenkins before 2.32 and LTS before 2.19.3 allows remote attackers… CVSS 3.0CRITICAL 9.8
See all 293 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences