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Not in CISA KEV
HIGH severity

CSRF vulnerability in Jenkins Libvirt Agents PluginGHSA-mm5c-7mpr-99fm

HIGHFix: jenkinsci/libvirt-slave-plugin@655eab9

GHSA-mm5c-7mpr-99fm is a high-severity (CVSS 8.8) Cross-Site Request Forgery (CSRF) vulnerability in org.jenkins-ci.plugins:libvirt-slave. A fix is available for org.jenkins-ci.plugins:libvirt-slave — see the affected versions and patch details below.

Also known asCVE-2021-21627
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.8%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs57th percentile — riskier than 57% of all scored CVEsHighest risk
0.00%0.44%0.88%1.32%0.1%0.8%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
☕org.jenkins-ci.plugins:libvirt-slave

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

Jenkins Libvirt Agents Plugin 1.9.0 and earlier does not require POST requests for a form submission endpoint, resulting in a cross-site request forgery (CSRF) vulnerability.

This vulnerability allows attackers to stop hypervisor domains.

Jenkins Libvirt Agents Plugin 1.9.1 requires POST requests for the affected HTTP endpoint.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.jenkins-ci.plugins:libvirt-slaveall versions1.9.1org.jenkins-ci.plugins:libvirt-slave:1.9.1

Affected Products

1 product · 1 configurations
Application
libvirt agentsjenkins
≤ 1.9.0
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.jenkins-ci.plugins:libvirt-slave, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.jenkins-ci.plugins:libvirt-slave to 1.9.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-mm5c-7mpr-99fm is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

Jenkins Libvirt Agents Plugin 1.9.0 and earlier does not require POST requests for a form submission endpoint, resulting in a cross-site request forgery (CSRF) vulnerability. This vulnerability allows attackers to stop hypervisor domains. Jenkins Libvirt Agents Plugin 1.9.1 requires POST requests for the affected HTTP endpoint.
O3 Security · Impact-Aware SCA

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CSRF vulnerability in Jenkins Libvirt Agents Plugin (High 8.8)