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High, CVSS 8.6amended

Semantic MediaWiki vulnerable to stored XSS through wikitext via improper use of non-reserved data attributes

CVE-2025-61682GHSA-hg8h-557g-q8pp

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (mediawiki/semantic-media-wiki 7.0.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
8.6 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
EPSS
  • CVE-2025-61682: 0.40% estimated exploitation activity in the next 30 days; percentile 34.39 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary The SemanticMediaWiki extension inserts the unsanitized value of a data attribute into the DOM as HTML, allowing for stored XSS through wikitext. Details In ext.smw.js, the data-subtab attribute of all elements with the smw-subtab class is parsed as JSON and appended to the innerHTML of the element: https://github.com/SemanticMediaWiki/SemanticMediaWiki/blob/62f1fa765b626e21d88999b97a3e8029db9fd385/res/smw/ext.smw.js#L37-L42 However, most data attributes (except for reserved ones) like data-subtab can be used in wikitext. Therefore, it is possible to insert arbitrary HTML and JS through wikitext. The decoded (" will turn to &quot;, but it will be decoded when it is retrieved through .dataset) value of the data-subtab attribute in the payload is "<img src='' onerror=alert(1)". This is valid JSON and returns a string with <img src='' onerror=alert(1) when being decoded. PoC 1. Create a page with the following contents: 2. Visit the page <img width="991" height="465" alt="image"…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-hg8h-557g-q8pp

  2. Revision 1 · created ·

    Published from osv record GHSA-hg8h-557g-q8pp

Agent brief

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# Patch Next advisory brief: CVE-2025-61682

Advisory: Semantic MediaWiki vulnerable to stored XSS through wikitext via improper use of non-reserved data attributes
IDs: CVE-2025-61682, GHSA-hg8h-557g-q8pp
Record: https://patchnext.com/advisories/cve-2025-61682 (revision 2, source checked 26 Oct 2026, 14:53 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.6)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: mediawiki/semantic-media-wiki 7.0.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist mediawiki/semantic-media-wiki: affected >= 3.1.0, < 7.0.0; fixed in 7.0.0

## Suggested inspection (read-only)
- Packagist mediawiki/semantic-media-wiki: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on mediawiki/semantic-media-wiki.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-hg8h-557g-q8pp (OSV record GHSA-hg8h-557g-q8pp lists affected ranges: Packagist mediawiki/semantic-media-wiki >=3.1.0 <7.0.0 (fixed))
- Verified: https://github.com/advisories/GHSA-hg8h-557g-q8pp (GitHub-reviewed advisory GHSA-hg8h-557g-q8pp lists affected ranges: Packagist mediawiki/semantic-media-wiki >=3.1.0 <7.0.0)

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