CVE-2021-21603
XSS vulnerability in Jenkins notification bar
5.4
MEDIUM
CVSS 3.1
EPSS 0.32%
Description
Jenkins 2.274 and earlier, LTS 2.263.1 and earlier does not escape notification bar response contents (typically shown after form submissions via Apply button). This results in a cross-site scripting (XSS) vulnerability exploitable by attackers able to influence notification bar contents. Jenkins 2.275, LTS 2.263.2 escapes the content shown in notification bars.
How to fix CVE-2021-21603
To remediate CVE-2021-21603, upgrade the affected package to a fixed version below.
- —upgrade to 2.274.1 or later
- —upgrade to 2.275 or later
Is CVE-2021-21603 being exploited?
Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 2.274.1
- from 0, < 2.275
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |