Vulnerability · Published Sep 23, 2026 · Assigned by GitHub_M

CVE-2026-63000REDAXO: Missing CSRF Protection on Package Update Action Allows Forced Addon Updates

Medium 6.4

In plain English

A medium-severity cross-site request forgery in core from redaxo. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.4Medium

Exploit odds (30 days)0.1%top 95.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

REDAXO is a PHP-based content management system. Prior to 5.21.2, rex_api_install_package_update in redaxo/src/addons/install/lib/api/api_package_update.php inherits the false default from rex_api_function::requiresCsrfProtection() instead of requiring a CSRF token. An unauthenticated attacker can cause a logged-in administrator's browser to request a selected package update from the configured REDAXO package server, changing installed addon code or disrupting the site without the administrator's intent. This issue is fixed in version 5.21.2.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	redaxo/source	5.21.2	GHSA-m8r3-22v6-g877

Affected products (as reported)

Vendor	Product	Versions
redaxo	core	< 5.21.2

Weakness: CWE-352 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:L

References

https://github.com/redaxo/core/security/advisories/GHSA-m8r3-22v6-g877 x_refsource_CONFIRM
https://github.com/redaxo/core/pull/6579 x_refsource_MISC
https://github.com/redaxo/core/commit/a13abbffbad4fdea46a4edc86cdba3335ca9e8f3 x_refsource_MISC
https://github.com/redaxo/core/releases/tag/5.21.2 x_refsource_MISC