CVE-2021-21619: XSS
First published: Wed Feb 24 2021(Updated: )
Jenkins Claim Plugin 2.18.1 and earlier does not escape the user display name shown in claims. This results in a stored cross-site scripting (XSS) vulnerability exploitable by attackers who are able to control the display names of Jenkins users, either via the security realm, or directly inside Jenkins. Everyone with a Jenkins account can change their own display name.\n\nClaim Plugin 2.18.2 escapes the user display name shown in claims.
Credit: jenkinsci-cert@googlegroups.com jenkinsci-cert@googlegroups.com jenkinsci-cert@googlegroups.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| <=2.18.1 | ||
| maven/org.jenkins-ci.plugins:claim | <=2.18.1 | 2.18.2 |
| Jenkins Claim | <=2.18.1 |
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Reference Links
- http://www.openwall.com/lists/oss-security/2021/02/24/3
- https://www.jenkins.io/security/advisory/2021-02-24/#SECURITY-2188%20(1)
- https://nvd.nist.gov/vuln/detail/CVE-2021-21619
- https://github.com/advisories/GHSA-48hr-jg4p-w4p4 (Advisory)
- https://www.jenkins.io/security/advisory/2021-02-24/#SECURITY-2188%20%281%29
Frequently Asked Questions
What is the severity of CVE-2021-21619?
CVE-2021-21619 is classified as a medium severity vulnerability due to its potential for user exploitation through stored cross-site scripting.
How do I fix CVE-2021-21619?
To fix CVE-2021-21619, update the Jenkins Claim Plugin to version 2.18.2 or later.
What impact does CVE-2021-21619 have on Jenkins users?
CVE-2021-21619 allows attackers to execute arbitrary scripts in the context of other users' sessions, potentially compromising their accounts.
Which versions of Jenkins Claim Plugin are affected by CVE-2021-21619?
Versions of Jenkins Claim Plugin prior to 2.18.2, specifically up to and including 2.18.1, are affected by CVE-2021-21619.
Can CVE-2021-21619 be exploited remotely?
Yes, CVE-2021-21619 can be exploited remotely by attackers who can control user display names within Jenkins.
- collector/nvd-index
- collector/github-advisory-latest
- alias/GHSA-48hr-jg4p-w4p4
- alias/CVE-2021-21619
- collector/github-advisory
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- source/MITRE
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- package-manager/maven
- canonical/jenkins claim
- version/jenkins claim/2.18.1