Semantic MediaWiki up to 7.1.x Debug Formatter SMW\Query\DebugFormatter debug cross site scripting

Summaryinfo

A vulnerability has been found in Semantic MediaWiki up to 7.1.x and classified as problematic. The affected element is the function SMW\Query\DebugFormatter of the component Debug Formatter. Performing a manipulation of the argument debug results in cross site scripting. This vulnerability is known as CVE-2026-77610. Remote exploitation of the attack is possible. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic has been found in Semantic MediaWiki up to 7.1.x. This affects the function SMW\Query\DebugFormatter of the component Debug Formatter. The manipulation of the argument debug with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as 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. This is going to have an impact on integrity. The summary by CVE is:

Semantic MediaWiki is a free, open-source extension to MediaWiki that lets users store and query data within the wiki's pages. Prior to version 7.2.0, query debug output (`format=debug`, or the `debug` request parameter on `Special:Ask`) is assembled by `SMW\Query\DebugFormatter` and emitted as raw HTML. Several of its sinks apply no output-context encoding, so attacker-controlled query input is reflected into the page without escaping. On `Special:Ask` the resulting string is concatenated into the page and sent through `OutputPage::addHTML`, never through the MediaWiki parser or Sanitizer. No special user right is required; an anonymous request suffices. This is a reflected XSS: the payload is taken from the request and echoed in the same response. Exploitation requires the query condition to target a text/blob-typed property (whose value is re-serialized verbatim); the predefined `_txt` properties (`Text`, etc.) that ship on every install satisfy this, so no attacker-created content is needed. Version 7.2.0 patches the issue.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-77610 since 08/20/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

Upgrading to version 7.2.0 eliminates this vulnerability.

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Productinfo

Type

• Content Management System

Name

• Semantic MediaWiki

Version

• 7.0
• 7.1

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CPE 2.2info

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