5.4

CVSS Score

3.1

-

CVSS Score

Basic Information

CVE ID

CVE-2021-21608

GHSA ID

GHSA-wv63-gwr9-5c55

EPSS Score

0.56428%

CWE

CWE-79

Published

5/24/2022

Updated

12/14/2023

KEV Status

Technology

Java

Basic Information

CVE ID

GHSA ID

EPSS Score

CWE

Published

Updated

KEV Status

Technology

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CVE-2021-21608

CVE-2021-21608: Stored XSS vulnerability in Jenkins button labels

Jenkins 2.274 and earlier, LTS 2.263.1 and earlier does not escape button labels in the Jenkins UI.

This results in a cross-site scripting vulnerability exploitable by attackers with the ability to control button labels. An example of buttons with a user-controlled label are the buttons of the Pipeline input step.

Jenkins 2.275, LTS 2.263.2 escapes button labels in the Jenkins UI.

(GitHub Advisory)

Miggo Vulnerability Database

→

CVE-2021-21608

CVE-2021-21608:

5.4

CVSS Score

3.1

-

CVSS Score

Basic Information

CVE ID

CVE-2021-21608

GHSA ID

GHSA-wv63-gwr9-5c55

EPSS Score

0.56428%

CWE

CWE-79

Published

5/24/2022

Updated

12/14/2023

KEV Status

Technology

Java

Basic Information

CVE ID

GHSA ID

EPSS Score

CWE

Published

Updated

KEV Status

Technology

Technical Details

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
org.jenkins-ci.main:jenkins-core	maven	< 2.263.1	2.275
org.jenkins-ci.main:jenkins-core	maven	>= 2.263.2, <= 2.274	2.275

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability stemmed from unescaped button label rendering in multiple UI components. Key evidence comes from the patch:- 1) hetero-list.js added title.escapeHTML() for menu options, 2) add-item.js switched to safe text node creation for labels, and 3) hudson-behavior.js added escaping for button labels. These components handled user-controlled labels without proper escaping in their original implementations, making them entry points for XSS payloads in button labels.

Vulnerable functions

Only Mi**o us*rs **n s** t*is s**tion

WAF Protection Rules

WAF Rule

W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.

Reasoning

*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.

5.4

-

Basic Information

Basic Information

Concerned about an active attack path?

CVE-2021-21608: Stored XSS vulnerability in Jenkins button labels

CVE-2021-21608:

5.4

-

Basic Information

Basic Information

Technical Details

Technical Details

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

WAF Protection Rules

WAF Rule

Reasoning

Vulnerability IntelligenceMiggo AI

Basic Information

Basic Information

5.4

5.4

CVE-2021-21608: Stored XSS vulnerability in Jenkins button labels

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

WAF Protection Rules

WAF Rule

Reasoning

Technical Details

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
Miggo AI