---
id: "CVE-2026-117534"
kind: "vulnerability"
aliases: ["CVE-2026-117534"]
title: "REDAXO CMS: history plugin lets a link delete snapshots or roll back articles"
severity: "medium"
cvss: 5.4
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["cms", "php", "redaxo", "runtime", "self-hosted"]
not_affected_if: ["addon-disabled", "already-on-5.21.3"]
published_at: "2026-10-27T11:17:33+00:00"
first_seen_at: "2026-10-27T11:31:28+00:00"
updated_at: "2026-10-27T11:32:07+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-117534", "first_seen_at": "2026-10-27T11:31:28+00:00"}]
---

# REDAXO CMS: history plugin lets a link delete snapshots or roll back articles

REDAXO before 5.21.3 has a structure/history plugin that accepts unvalidated GET requests, so a crafted link can clear all article snapshots or revert articles to earlier states. An attacker gets to destroy or roll back backend content when a logged-in user opens the link.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed REDAXO version in the backend or in the `redaxo/src/core/boot.php` version constant; a version below `5.21.3` is exposed.
- Confirm the structure/history addon is installed and active in the backend addon list.

## Fix

- Upgrade REDAXO to `5.21.3` or later.
- Until upgraded, disable the structure/history addon.

## Timeline

- 2026-10-27T11:31:28+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-117534

## From the sources

REDAXO before 5.21.3 contains a cross-site request forgery vulnerability in the structure/history plugin that allows attackers to delete history or roll back content via unvalidated GET requests. Attackers can lure logged-in backend users to a page triggering func=clearall or rex_history_function=snap, permanently deleting all article snapshots or reverting articles to earlier states.

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