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MEDIUM severity

CVE-2021-21699 — uno-choice

MEDIUMFix: jenkinsci/active-choices-plugin@4529ab6

CVE-2021-21699 is a medium-severity (CVSS 5.4) Cross-site Scripting (XSS) vulnerability in org.biouno:uno-choice. EPSS puts its 30-day exploitation probability at 88.5% (100th percentile). A fix is available for org.biouno:uno-choice — see the affected versions and patch details below.

Stored XSS vulnerability in Jenkins Active Choices Plugin

Also known asGHSA-rp4x-h577-chvq
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 ↗
88.5%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%33.3%66.7%100.0%0.2%88.5%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.biouno:uno-choice

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 Active Choices Plugin 2.5.6 and earlier does not escape the parameter name of reactive parameters and dynamic reference parameters.

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

Jenkins Active Choices Plugin 2.5.7 escapes references to parameter names.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.biouno:uno-choiceall versions2.5.7org.biouno:uno-choice:2.5.7

Affected Products

1 product · 1 configurations
Application
active choicesjenkins
≤ 2.5.6
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.biouno:uno-choice, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.biouno:uno-choice to 2.5.7 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-21699 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 Active Choices Plugin 2.5.6 and earlier does not escape the parameter name of reactive parameters and dynamic reference parameters. This results in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Job/Configure permission. Jenkins Active Choices Plugin 2.5.7 escapes references to parameter names.
O3 Security · Impact-Aware SCA

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CVE-2021-21699: uno-choice XSS — Fixed in 2.5.7