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Advisory record · GHSA-mf2p-wjp4-99pq

REDAXO: Stored XSS via Unescaped Media Manager Type Name in `mediaIsInUse()`

CVSS 4.8 MediumEPSS 0.0020 · 9th percentile

Published by the GitHub Advisory Database at 23 Sept 2026, 14:04 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
redaxo/sourcePackagist<5.21.25.21.2
Identifiers
GHSA-mf2p-wjp4-99pq · CVE-2026-63001 · PKSA-hspm-hyxh-6wd5
Weakness (CWE)
CWE-79
Tags
Published
23 Sept 2026
Updated
23 Sept 2026

Machine-written summary

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

The redaxo/source Packagist package is vulnerable in versions before 5.21.2. In the Media Manager addon, the warning shown when an administrator deletes a media file that is used by a Media Manager effect includes the type name without HTML escaping, which allows stored cross-site scripting. An attacker who can edit Media Manager types can store a script payload in a type name that then runs in the browser of an administrator who tries to delete a linked media file, which could lead to session theft or account takeover. The package is fixed in 5.21.2, so upgrade to that version 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
4.8 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0020, the 9th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 13:55 UTC First seen by agentprime
  2. 31 Oct 2026, 13:55 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.