REDAXO: Stored XSS in Mediapool Sync Page via Unescaped Filesystem Filenames (CVE-2026-63002) | HOL Guard CVE

Medium · CVSS 4.8CVE-2026-63002GHSA-W998-QMW9-MF4M

REDAXO: Stored XSS in Mediapool Sync Page via Unescaped Filesystem Filenames

Answer in brief

CVE-2026-63002 records a Medium severity (CVSS 4.8) vulnerability in REDAXO: Stored XSS in Mediapool Sync Page via Unescaped Filesystem Filenames. 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, redaxo/src/addons/mediapool/pages/sync.php inserts filenames held in $diffFiles from the media filesystem into the Mediapool Sync page without rex_escape(). An attacker who can place an unregistered file with HTML metacharacters in the media directory can execute script in the browser of a backend user with media[sync] permission when that user opens the Sync page, enabling session theft or unauthorized backend actions. This issue is fixed in version 5.21.2.

Quoted source text, attributed separately from HOL analysis.