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MEDIUM severity

CVE-2021-21667 — scriptler

MEDIUMFix: jenkinsci/scriptler-plugin@ea9c4e6

CVE-2021-21667 is a medium-severity (CVSS 5.4) Cross-site Scripting (XSS) vulnerability in org.jenkins-ci.plugins:scriptler. EPSS puts its 30-day exploitation probability at 75.7% (100th percentile). A fix is available for org.jenkins-ci.plugins:scriptler — see the affected versions and patch details below.

Stored XSS vulnerability in Jenkins Scriptler Plugin

Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
75.7%probability of exploitation in next 30 days
Very High Risk0.00%
Lower risk than most CVEs100th percentile — riskier than 100% of all scored CVEsHighest risk
0.00%32.8%65.6%98.4%0.2%75.7%Apr 26Aug 26Oct 26

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

How urgent is this, really

CVE-2021-21667 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the 50–90% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
☕org.jenkins-ci.plugins:scriptler

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 Scriptler Plugin 3.2 and earlier does not escape parameter names shown in job configuration forms.

This results in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Scriptler/Configure permission.

Jenkins Scriptler Plugin 3.3 escapes parameter names shown in job configuration forms.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.jenkins-ci.plugins:scriptlerall versions3.3org.jenkins-ci.plugins:scriptler:3.3

Affected Products

1 product · 1 configurations
Application
scriptlerjenkins
≤ 3.2
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:scriptler, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.jenkins-ci.plugins:scriptler to 3.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-21667 is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

Jenkins Scriptler Plugin 3.2 and earlier does not escape parameter names shown in job configuration forms. This results in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Scriptler/Configure permission. Jenkins Scriptler Plugin 3.3 escapes parameter names shown in job configuration forms.
O3 Security · Impact-Aware SCA

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