CVE-2021-21635

Stored XSS vulnerability in Jenkins REST List Parameter Plugin

5.4 MediumFix available

Jenkins REST List Parameter Plugin 1.3.0 and earlier does not escape a parameter name reference in embedded JavaScript, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Job/Configure permission.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: Required

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: None

Exploit likelihood

8.76%Up 8.1 points since Apr 14, 2021

What each source reports

NVD Score used 5.4

Record: CVE-2021-21635
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CVSS 2.0: 3.5 LowAV:N/AC:M/Au:S/C:N/I:P/A:N
Weakness: CWE-79
Updated: 2026-11-02

CVE List No score

Record: CVE-2021-21635
Updated: 2026-11-02

EUVDEUVD-2022-5701 No score

Record: EUVD-2022-5701
Updated: 2026-11-03

GitHub AdvisoriesGHSA-x3m6-vcp7-98mr 5.4

Stored XSS vulnerability in Jenkins REST List Parameter Plugin

Jenkins REST List Parameter Plugin 1.3.0 and earlier does not escape a parameter name reference in embedded JavaScript.

This results in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Job/Configure permission.

Jenkins REST List Parameter Plugin 1.3.1 no longer identifies a parameter using user-specified content.

Record: GHSA-x3m6-vcp7-98mr
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

OSV 5.4

Record: CVE-2021-21635
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

OSVGHSA-x3m6-vcp7-98mr 5.4

Stored XSS vulnerability in Jenkins REST List Parameter Plugin

Jenkins REST List Parameter Plugin 1.3.0 and earlier does not escape a parameter name reference in embedded JavaScript.

This results in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Job/Configure permission.

Jenkins REST List Parameter Plugin 1.3.1 no longer identifies a parameter using user-specified content.

Record: GHSA-x3m6-vcp7-98mr
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`io.jenkins.plugins:rest-list-parameter` Maven	through 1.3.0	1.3.1
`io.jenkins.plugins:rest-list-parameter` Maven	before 1.3.1, plus listed versions 1.0.01.0.11.1.01.2.01.2.11.2.21.3.0	1.3.1

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-21635 is a medium vulnerability (CVSS 5.4) in Jenkins Rest List Parameter, published March 30, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 8.76%, the 95th percentile. Fixed in io.jenkins.plugins:rest-list-parameter 1.3.1.