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XSS vulnerability in Jenkins notification bar

Moderate severity GitHub Reviewed Published May 24, 2022 to the GitHub Advisory Database • Updated Dec 14, 2023

Package

maven org.jenkins-ci.main:jenkins-core (Maven)

Affected versions

< 2.263.1
>= 2.263.2, <= 2.274

Patched versions

2.275
2.275

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.

References

Published by the National Vulnerability Database Jan 13, 2021
Published to the GitHub Advisory Database May 24, 2022
Reviewed Jun 23, 2022
Last updated Dec 14, 2023

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS score

0.054%
(25th percentile)

Weaknesses

CVE ID

CVE-2021-21603

GHSA ID

GHSA-98gq-6hxg-52r6

Source code

Credits

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