{"id":"CVE-2026-116894","kind":"vulnerability","aliases":["CVE-2026-116894"],"related":[],"title":"REDAXO CMS: old sessions survive password change for up to three months","description":"REDAXO before 5.21.5 contains an insufficient session expiration vulnerability that allows attackers to retain account access by keeping the current session and stay-logged-in key valid after a password change. Attackers who obtained a user's session id or stay-logged-in cookie can keep backend access after the password change, via the cookie for up to three months.","summary":"REDAXO before 5.21.5 does not invalidate the current session and stay-logged-in key when a user changes their password. An attacker who already holds a user's session id or stay-logged-in cookie keeps backend access after the password change, for up to three months via the cookie.","severity":"medium","cvss":4.2,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["cms","php","redaxo","runtime","self-hosted"],"not_affected_if":["fixed-version","no-backend-users"],"how_to_check":"- Check the installed REDAXO version in the project's core files, e.g. `redaxo/src/core/boot.php` or the version string in the backend, and see whether it is below `5.21.5`\n- Confirm whether the backend 'stay logged in' option is enabled for users","fix":"- Upgrade REDAXO to `5.21.5` or later\n- After upgrading, log out all backend users or rotate their stay-logged-in keys, since existing cookies may remain valid until they are revoked","status":"open","published_at":"2026-10-27T11:17:32+00:00","first_seen_at":"2026-10-27T11:31:27+00:00","triaged_at":"2026-10-27T11:32:20+00:00","updated_at":"2026-10-27T11:32:20+00:00","category":"runtime","confidence":0.6,"triage":{"at":"2026-10-27T11:32:20Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade REDAXO to `5.21.5` or later\n- After upgrading, log out all backend users or rotate their stay-logged-in keys, since existing cookies may remain valid until they are revoked","reach":"internet","title":"REDAXO CMS: old sessions survive password change for up to three months","impact":"medium","summary":"REDAXO before 5.21.5 does not invalidate the current session and stay-logged-in key when a user changes their password. An attacker who already holds a user's session id or stay-logged-in cookie keeps backend access after the password change, for up to three months via the cookie.","category":"runtime","nicknames":[],"who_cares":["redaxo","php","self-hosted","cms"],"confidence":0.6,"needs_auth":"yes","worst_case":"Attacker keeps backend admin access after the user changes password","analyst_note":"Check the REDAXO 5.21.5 release notes or the NVD entry for the exact session and stay-logged-in cookie behaviour and any workaround before upgrading.","how_to_check":"- Check the installed REDAXO version in the project's core files, e.g. `redaxo/src/core/boot.php` or the version string in the backend, and see whether it is below `5.21.5`\n- Confirm whether the backend 'stay logged in' option is enabled for users","needs_analyst":true,"not_affected_if":["fixed-version","no-backend-users"],"who_is_affected":"Sites running REDAXO CMS before 5.21.5 with a backend where users have logged in, especially where the stay-logged-in cookie is used. An attacker must first have obtained a session id or stay-logged-in cookie, for example through a stolen device or a leaked cookie. Sites on a fixed version, or with no backend users, can skip it.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000652,"input_tokens":3328,"output_tokens":639,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-116894':15A,18A '-2026':14A,17A '5.21.5':28B,80C 'access':65B,93C,127C 'account':92C 'allow':88C 'alreadi':50B 'attack':48B,89C,110C 'backend':64B,126C 'chang':7A,44B,69B,109C,131C 'cms':2A,19B 'contain':81C 'cooki':62B,77B,123C,134C 'current':33B,97C 'cve':13A,16A 'expir':85C 'hold':51B 'host':25B 'id':56B,117C 'insuffici':83C 'invalid':31B 'keep':63B,95C,125C 'key':40B,104C 'log':38B,60B,102C,121C 'month':12A,74B,139C 'obtain':112C 'old':3A 'password':6A,46B,68B,108C,130C 'php':20B 'redaxo':1A,21B,26B,78C 'retain':91C 'runtim':22B 'self':24B 'self-host':23B 'session':4A,34B,55B,84C,98C,116C 'stay':37B,59B,101C,120C 'stay-logged-in':36B,58B,100C,119C 'surviv':5A 'three':11A,73B,138C 'user':43B,53B,114C 'valid':105C 'via':75B,132C 'vulner':86C","nicknames":[],"mitigations":[],"who_affected":"Sites running REDAXO CMS before 5.21.5 with a backend where users have logged in, especially where the stay-logged-in cookie is used. An attacker must first have obtained a session id or stay-logged-in cookie, for example through a stolen device or a leaked cookie. Sites on a fixed version, or with no backend users, can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-27T11:17:32+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/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-2026-116894","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-116894","severity":null,"published_at":"2026-10-27T11:17:32+00:00","modified_at":"2026-10-27T11:17:32+00:00","first_seen_at":"2026-10-27T11:31:27+00:00","fetched_at":"2026-10-27T11:31:27+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"}