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Advisory record · GHSA-v65j-hff3-753c

Mediawiki EmbedVideo Extension has stored XSS via malformed src url with $wgEmbedVideoRequireConsent disabled

CVSS 7.5 HighEPSS 0.0033 · 26th percentile

Published by the GitHub Advisory Database at 25 Sept 2026, 15:03 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
starcitizenwiki/embedvideoPackagist<4.1.04.1.0
Identifiers
GHSA-v65j-hff3-753c · CVE-2026-57440 · PKSA-1f7b-5f9b-ggt9
Weakness (CWE)
CWE-79 · CWE-80
Tags
Published
25 Sept 2026
Updated
25 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The EmbedVideo extension for MediaWiki, published on Packagist as starcitizenwiki/embedvideo, is vulnerable in versions before 4.1.0. The problem occurs when the $wgEmbedVideoRequireConsent setting is disabled, which is not the default: malformed video URLs or IDs can include double quotes that break out of the iframe src attribute. An attacker who can edit a wiki page can use this to inject JavaScript that runs in the wiki's origin for every visitor to that page, with no further interaction needed. Upgrade to version 4.1.0 or later.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0033, the 26th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 13:54 UTC First seen by agentprime
  2. 31 Oct 2026, 13:54 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.