CVE-2021-21610

Jenkins 2.274 and earlier, LTS 2.263.1 and earlier does not implement any restrictions for the URL rendering a formatted preview of markup passed as a query parameter, resulting in a reflected cross-site scripting (XSS) vulnerability if the configured markup formatter does not prohibit unsafe elements (JavaScript) in markup.
Cross-site Scripting
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
6.1 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
jenkinsCNA
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CVEADP
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Base Score
CVSS 3.x
EPSS Score
Percentile: 54%
VendorProductVersion
jenkinsjenkins
𝑥
≤ 2.263.1
jenkinsjenkins
𝑥
≤ 2.274
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://www.jenkins.io/security/advisory/2021-01-13/#SECURITY-2153
https://www.jenkins.io/security/advisory/2021-01-13/#SECURITY-2153