{"id":"CVE-2026-117534","kind":"vulnerability","aliases":["CVE-2026-117534"],"related":[],"title":"REDAXO CMS: history plugin lets a link delete snapshots or roll back articles","description":"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.","summary":"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.","severity":"medium","cvss":5.4,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["cms","php","redaxo","runtime","self-hosted"],"not_affected_if":["addon-disabled","already-on-5.21.3"],"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.\n- Confirm the structure/history addon is installed and active in the backend addon list.","fix":"- Upgrade REDAXO to `5.21.3` or later.\n- Until upgraded, disable the structure/history addon.","status":"open","published_at":"2026-10-27T11:17:33+00:00","first_seen_at":"2026-10-27T11:31:28+00:00","triaged_at":"2026-10-27T11:32:07+00:00","updated_at":"2026-10-27T11:32:07+00:00","category":"runtime","confidence":0.7,"triage":{"at":"2026-10-27T11:32:07Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade REDAXO to `5.21.3` or later.\n- Until upgraded, disable the structure/history addon.","reach":"internet","title":"REDAXO CMS: history plugin lets a link delete snapshots or roll back articles","impact":"medium","summary":"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.","category":"runtime","nicknames":[],"who_cares":["redaxo","php","self-hosted","cms"],"confidence":0.7,"needs_auth":"no","worst_case":"article snapshots deleted or content reverted via a logged-in user's click","analyst_note":"","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.\n- Confirm the structure/history addon is installed and active in the backend addon list.","needs_analyst":false,"not_affected_if":["already-on-5.21.3","addon-disabled"],"who_is_affected":"Sites running REDAXO CMS before 5.21.3 with the structure/history plugin enabled and logged-in backend users who can be lured to an external page. Sites without that plugin, or already on 5.21.3 or later, are not affected by this flaw.","user_interaction":"yes","needs_special_setup":"yes","severity_if_unknown":"medium"},"cost_usd":0.000604,"input_tokens":3346,"output_tokens":539,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-117534':16A,19A '-2026':15A,18A '5.21.3':29B,75C 'accept':35B 'allow':89C 'articl':13A,46B,50B,124C,128C 'attack':55B,90C,102C 'back':12A,61B,96C 'backend':62B,108C 'clear':44B 'clearal':115C 'cms':2A,20B 'contain':76C 'content':63B,97C 'craft':41B 'cross':79C 'cross-sit':78C 'cve':14A,17A 'delet':8A,92C,122C 'destroy':58B 'earlier':52B,130C 'forgeri':82C 'func':114C 'function':119C 'get':37B,56B,100C 'histori':3A,93C,118C 'host':26B 'let':5A 'link':7A,42B,72B 'log':67B,106C 'logged-in':66B,105C 'lure':104C 'open':70B 'page':112C 'perman':121C 'php':21B 'plugin':4A,33B,87C 'redaxo':1A,22B,27B,73C 'request':38B,81C,101C 'revert':49B,127C 'rex':117C 'roll':11A,60B,95C 'runtim':23B 'self':25B 'self-host':24B 'site':80C 'snap':120C 'snapshot':9A,47B,125C 'state':53B,131C 'structure/history':32B,86C 'trigger':113C 'unvalid':36B,99C 'user':69B,109C 'via':98C 'vulner':83C","nicknames":[],"mitigations":[],"who_affected":"Sites running REDAXO CMS before 5.21.3 with the structure/history plugin enabled and logged-in backend users who can be lured to an external page. Sites without that plugin, or already on 5.21.3 or later, are not affected by this flaw.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-27T11:17:33+00:00","kev":null,"cvss_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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-117534","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-117534","severity":null,"published_at":"2026-10-27T11:17:33+00:00","modified_at":"2026-10-27T11:17:33+00:00","first_seen_at":"2026-10-27T11:31:28+00:00","fetched_at":"2026-10-27T11:31:28+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}