REDAXO: Stored XSS via Unescaped Media Manager Type Name in `mediaIsInUse()` (CVE-2026-63001) | HOL Guard CVE

Medium · CVSS 4.8CVE-2026-63001GHSA-MF2P-WJP4-99PQ

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

Answer in brief

CVE-2026-63001 records a Medium severity (CVSS 4.8) vulnerability in REDAXO: Stored XSS via Unescaped Media Manager Type Name in `mediaIsInUse()`. The current sources do not mark it as known exploited. The current feed maps redaxo/source (composer), redaxo/core (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 23, 2026Updated Sep 23, 2026Source checked Sep 23, 2026First seen by HOL Sep 23, 2026Material review Sep 23, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 4.8
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 4.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps redaxo/source (composer), redaxo/core (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
redaxo/sourcecomposer	<=5.21.1	5.21.2
redaxo/coregeneric	<5.21.2	5.21.2

Recommended response

Check inventory. Check lockfiles and deployed manifests for redaxo/source, redaxo/core.
Review the reported fix. Update redaxo/source to 5.21.2; redaxo/core to 5.21.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 23, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 23, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 23, 2026

Sources and claim methodology

Upstream source description

REDAXO is a PHP-based content management system. Prior to 5.21.2, the mediaIsInUse() handler in redaxo/src/addons/media_manager/lib/media_manager.php inserts a Media Manager type name into raw backend warning HTML without escaping it when invoked through MEDIA_IS_IN_USE. An administrator with Media Manager access can store HTML in a type name, and the payload executes in another administrator's browser when that administrator tries to delete media referenced by the type's effects, enabling session theft or unauthorized backend actions. This issue is fixed in version 5.21.2.

Quoted source text, attributed separately from HOL analysis.