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Not in CISA KEV
MEDIUM severity

CVE-2021-21700 — scriptler

MEDIUMFix: jenkinsci/scriptler-plugin@7e4fa9b

CVE-2021-21700 is a medium-severity (CVSS 5.4) Cross-site Scripting (XSS) vulnerability in org.jenkins-ci.plugins:scriptler. 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 28, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.7%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs53th percentile — riskier than 53% of all scored CVEsHighest risk
0.00%0.40%0.80%1.21%0.2%0.7%Apr 26Aug 26Oct 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: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 3.3 and earlier does not escape the name of scripts on the UI when asking to confirm their deletion.

This results in a stored cross-site scripting (XSS) vulnerability exploitable by attackers able to create Scriptler scripts.

Jenkins Scriptler Plugin 3.4 escapes the name of scripts on the UI when asking to confirm their deletion.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.jenkins-ci.plugins:scriptlerall versions3.4org.jenkins-ci.plugins:scriptler:3.4

Affected Products

1 product · 1 configurations
Application
scriptlerjenkins
≤ 3.3
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 3.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-21700 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 3.3 and earlier does not escape the name of scripts on the UI when asking to confirm their deletion. This results in a stored cross-site scripting (XSS) vulnerability exploitable by attackers able to create Scriptler scripts. Jenkins Scriptler Plugin 3.4 escapes the name of scripts on the UI when asking to confirm their deletion.
O3 Security · Impact-Aware SCA

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CVE-2021-21700: scriptler XSS — Fixed in 3.4