UpHeron
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Servers and applications

CVE-2021-21603

Jenkins 2.274 and earlier, LTS 2.263.1 and earlier does not escape notification bar response contents, resulting in a cross-site scripting (XSS) vulnerability.

Severity
Medium 5.4
Published
13 Jan 2021
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Sources
NVD

Affected software

SoftwareAffected versions
JenkinsServers and applications · cpe:a:jenkins:jenkins
  • Every version up to 2.263.1
  • Every version up to 2.274

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-21603
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-21603