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MEDIUM severity

CVE-2020-2137 — timestamper

MEDIUMFix: jenkinsci/timestamper-plugin@6637c3e

CVE-2020-2137 is a medium-severity (CVSS 4.8) Cross-site Scripting (XSS) vulnerability in org.jenkins-ci.plugins:timestamper. A fix is available for org.jenkins-ci.plugins:timestamper — see the affected versions and patch details below.

Stored XSS vulnerability in Jenkins Timestamper Plugin

Also known asGHSA-6xxf-rwv4-mrjm
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 5, 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%1.20%0.2%0.7%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:timestamper

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

Timestamper Plugin 1.11.1 and earlier does not escape or sanitize the HTML formatting used to display the timestamps in console output for builds.

This results in a stored cross-site scripting vulnerability that can be exploited by users with Overall/Administer permission.

Timestamper Plugin 1.11.2 sanitizes the HTML formatting for timestamps and only allows basic, safe HTML formatting.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.jenkins-ci.plugins:timestamperall versions1.11.2org.jenkins-ci.plugins:timestamper:1.11.2

Affected Products

1 product · 1 configurations
Application
timestamperjenkins
≤ 1.11.1
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:timestamper, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.jenkins-ci.plugins:timestamper to 1.11.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-2137 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

Timestamper Plugin 1.11.1 and earlier does not escape or sanitize the HTML formatting used to display the timestamps in console output for builds. This results in a stored cross-site scripting vulnerability that can be exploited by users with Overall/Administer permission. Timestamper Plugin 1.11.2 sanitizes the HTML formatting for timestamps and only allows basic, safe HTML formatting.
O3 Security · Impact-Aware SCA

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CVE-2020-2137: timestamper XSS — Fixed in 1.11.2