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Medium, CVSS 6.1amended

Semantic MediaWiki has a query debug output XSS (DebugFormatter)

CVE-2026-77610GHSA-q5fm-9mx6-44f4

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (mediawiki/semantic-media-wiki 7.2.0), 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
6.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS
  • CVE-2026-77610: 0.28% estimated exploitation activity in the next 30 days; percentile 20.87 (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.

Query debug output XSS Failure mode Semantic MediaWiki's 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: - buildHTML() echoes the re-serialized ASK query string escaping only ; <, , ", ' pass through. - prettifySQL() returns the generated SQL verbatim. Query value literals are inlined into the SQL through the database layer's quoting (SQL-escaping only, no HTML encoding), so markup in a value survives. - prettifyExplain() echoes EXPLAIN output; on PostgreSQL the plan text contains the WHERE literals. 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…

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

    Amended from ghsa record GHSA-q5fm-9mx6-44f4

  2. Revision 1 · created ·

    Published from osv record GHSA-q5fm-9mx6-44f4

Agent brief

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# Patch Next advisory brief: CVE-2026-77610

Advisory: Semantic MediaWiki has a query debug output XSS (`DebugFormatter`)
IDs: CVE-2026-77610, GHSA-q5fm-9mx6-44f4
Record: https://patchnext.com/advisories/cve-2026-77610 (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: Medium (CVSS 6.1)
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 7.2.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist mediawiki/semantic-media-wiki: affected <= 7.1.0; fixed in 7.2.0

## 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-q5fm-9mx6-44f4 (OSV record GHSA-q5fm-9mx6-44f4 lists affected ranges: Packagist mediawiki/semantic-media-wiki >=0 <7.2.0 (fixed))
- Verified: https://github.com/advisories/GHSA-q5fm-9mx6-44f4 (GitHub-reviewed advisory GHSA-q5fm-9mx6-44f4 lists affected ranges: Packagist mediawiki/semantic-media-wiki >=0 <=7.1.0)

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