CVE-2021-21699
MediumStored XSS vulnerability in Jenkins Active Choices Plugin
Published Nov 15, 2021 · Updated Jul 8, 2026 · Also known as GHSA-rp4x-h577-chvq, TR-21-0920
Key Facts
Patch immediately- CVE-2021-21699 is a medium-severity vulnerability (CVSS 5.4 v3.1) affecting Active Choices (Jenkins), org.biouno:uno-choice (maven), Jenkins Active Choices Plugin.
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 88% probability of exploitation in the next 30 days.
- Fixed versions are available, including Active Choices <=2.5.6, org.biouno:uno-choice 2.5.7, Active Choices 2.5.6.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v3.1
5.4
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
EPSS (30-day exploit likelihood)
88%
Higher than 99.7% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
None known
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Description
Jenkins Active Choices Plugin 2.5.6 and earlier does not escape the parameter name of reactive parameters and dynamic reference parameters, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Job/Configure permission.
Affected Products
3 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Active ChoicesJenkins | See advisory | 2.5.6 |
| org.biouno:uno-choicemaven | See advisory | 2.5.7 |
| Jenkins Active Choices Plugin | >= unspecified | n/a |
Patched Releases
Active Choices
<=2.5.6
org.biouno:uno-choice
2.5.7
Timeline
Publicly disclosed
Nov 15, 2021
Last updated
Jul 8, 2026
Weakness Type
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
References
- advisoryGHSA advisory
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2021-21699
- advisoryhttps://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-21699
- advisoryhttps://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-21700
- advisoryhttps://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-21701
FAQ
Common Questions.
Jenkins Active Choices Plugin 2.5.6 and earlier does not escape the parameter name of reactive parameters and dynamic reference parameters, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Job/Configure permission.
Affected: Active Choices (Jenkins); org.biouno:uno-choice (maven); Jenkins Active Choices Plugin versions >= unspecified. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Active Choices <=2.5.6, org.biouno:uno-choice 2.5.7, Active Choices 2.5.6.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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