Wikimedia Parsoid up to 0.16.5/0.20.3/0.21.0 Sanitizer.Php cross site scripting

Summaryinfo

A vulnerability was found in Wikimedia Parsoid up to 0.16.5/0.20.3/0.21.0. It has been declared as problematic. Impacted is an unknown function of the file includes/parser/Sanitizer.Php. Such manipulation leads to cross site scripting. This vulnerability is uniquely identified as CVE-2025-61638. The attack can be launched remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Wikimedia Parsoid up to 0.16.5/0.20.3/0.21.0 and classified as problematic. Affected by this issue is some unknown processing of the file includes/parser/Sanitizer.Php. 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:

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation MediaWiki, Wikimedia Foundation Parsoid. This vulnerability is associated with program files includes/parser/Sanitizer.Php, src/Core/Sanitizer.Php. This issue affects MediaWiki: from * before 1.39.14, 1.43.4, 1.44.1; Parsoid: from * before 0.16.6, 0.20.4, 0.21.1.

The advisory is shared for download at phabricator.wikimedia.org. This vulnerability is handled as CVE-2025-61638 since 09/29/2025. The exploitation is known to be easy. The attack may be launched remotely. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.007.

By approaching the search of inurl:includes/parser/Sanitizer.Php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 0.16.6, 0.20.4 or 0.21.1 eliminates this vulnerability.

The vulnerability is also documented in the databases at CNNVD (CNNVD-202602-183) and EUVD (EUVD-2025-206633). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Content Management System

Vendor

• Wikimedia

Name

• Parsoid

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.16.0
• 0.16.1
• 0.16.2
• 0.16.3
• 0.16.4
• 0.16.5
• 0.17
• 0.18
• 0.19
• 0.20
• 0.20.0
• 0.20.1
• 0.20.2
• 0.20.3
• 0.21.0

CPE 2.3info

• 🔒
• 🔒
• 🔒

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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