Jenkins GitHub Plugin up to 1.46.0 cross site scripting

Summaryinfo

A vulnerability, which was classified as problematic, was found in Jenkins GitHub Plugin up to 1.46.0. Affected by this issue is some unknown functionality. Such manipulation leads to cross site scripting. This vulnerability is uniquely identified as CVE-2026-42523. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Jenkins GitHub Plugin up to 1.46.0. It has been rated as problematic. Affected by this issue is some unknown functionality. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. CVE summarizes:

Jenkins GitHub Plugin 1.46.0 and earlier improperly processes the current job URL as part of JavaScript implementing validation of the feature "GitHub hook trigger for GITScm polling", resulting in a stored cross-site scripting (XSS) vulnerability exploitable by non-anonymous attackers with Overall/Read permission.

The advisory is shared for download at jenkins.io. This vulnerability is handled as CVE-2026-42523 since 04/28/2026. The exploitation is known to be easy. The attack may be launched remotely. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1059.007.

The vulnerability scanner Nessus provides a plugin with the ID 310885 (Jenkins plugins Multiple Vulnerabilities (2026-04-29)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (310885), EUVD (EUVD-2026-26225) and CERT Bund (WID-SEC-2026-1320). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

• Jenkins Jenkins

Productinfo

Type

• Continuous Integration Software

Vendor

• Jenkins

Name

• GitHub Plugin

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20
• 1.21
• 1.22
• 1.23
• 1.24
• 1.25
• 1.26
• 1.27
• 1.28
• 1.29
• 1.30
• 1.31
• 1.32
• 1.33
• 1.34
• 1.35
• 1.36
• 1.37
• 1.38
• 1.39
• 1.40
• 1.41
• 1.42
• 1.43
• 1.44
• 1.45
• 1.46.0

License

• open-source

Website

• Vendor: https://jenkins.io/

CPE 2.3info

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CPE 2.2info

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Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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