CVE-2026-42523Network attack vector

Stored XSS via current job URL processing

Published Apr 29, 2026 · Updated Apr 29, 2026

Stored XSS in Jenkins GitHub Plugin 1.46.0 and earlier allows remote authenticated users to execute script in a victim's browser. Validation JavaScript for the GitHub hook trigger for GITScm polling improperly processes the current job URL, leaving script content stored for later rendering. Overall/Read permission is sufficient, and a victim must load the affected content before the script can access data or perform actions available to the victim's Jenkins session.

CVSS severity9.0
Critical
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Jenkins GitHub Plugin 1.46.0 and earlier allows remote authenticated users to execute script in a victim's browser. Validation JavaScript for the GitHub hook trigger for GITScm polling improperly processes the current job URL, leaving script content stored for later rendering. Overall/Read permission is sufficient, and a victim must load the affected content before the script can access data or perform actions available to the victim's Jenkins session.

The record

CVE
CVE-2026-42523
Published
Apr 29, 2026
Updated
Apr 29, 2026
Vendor
Jenkins Project
Product
GitHub Plugin
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.46.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Jenkins Project · GitHub Pluginversion=0 <=1.46.0

Published CVSS scores

9.0CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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