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Medium, CVSS 6.1amended

Semantic MediaWiki has an open redirect in Special:URIResolver

CVE-2026-77609GHSA-hw3m-8j5x-94ff

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-2026-77609: 0.27% estimated exploitation activity in the next 30 days; percentile 19.00 (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.

Failure mode Special:URIResolver resolves its user-controlled subpage to a MediaWiki title and issues an HTTP 303 redirect to $title-getFullURL() without validating the resolved target. A crafted subpage can make that target point off-host: an interwiki prefix redirects to the foreign wiki (for example Special:URIResolver/mw-3AFoo, which decodes to mw:Foo, redirects to https://www.mediawiki.org/wiki/Foo), and where the resolved URL carries an authority the target can even embed user:pass@host credentials. The result is an open redirect to an attacker-influenced host, usable for phishing from a trusted wiki URL. Remediation - The resolved target URL is parsed and compared against the current host at the redirect sink. - The redirect is rejected (bad-title error page) when a user or pass component is present, or when the host does not match the current host. Maintenance note Redirect code must validate the final target URL, not just the input path. Host comparison belongs at the…

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

    Amended from ghsa record GHSA-hw3m-8j5x-94ff

  2. Revision 1 · created ·

    Published from osv record GHSA-hw3m-8j5x-94ff

Agent brief

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# Patch Next advisory brief: CVE-2026-77609

Advisory: Semantic MediaWiki has an open redirect in Special:URIResolver
IDs: CVE-2026-77609, GHSA-hw3m-8j5x-94ff
Record: https://patchnext.com/advisories/cve-2026-77609 (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-hw3m-8j5x-94ff (OSV record GHSA-hw3m-8j5x-94ff lists affected ranges: Packagist mediawiki/semantic-media-wiki >=0 <7.2.0 (fixed))
- Verified: https://github.com/advisories/GHSA-hw3m-8j5x-94ff (GitHub-reviewed advisory GHSA-hw3m-8j5x-94ff lists affected ranges: Packagist mediawiki/semantic-media-wiki >=0 <=7.1.0)

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