{"id":"CVE-2026-123528","kind":"vulnerability","aliases":["CVE-2026-123528"],"related":[],"title":"Vikunja: revoked access tokens keep working after logout or account disable","description":"Vikunja before 2.7.1 contains an insufficient session expiration vulnerability that allows holders of revoked access tokens to keep authenticating because SetupTokenMiddleware skips session and account-status checks. Attackers with a stolen token can, after logout, password reset, or account disabling, mint OAuth sessions via /oauth/authorize or tk_ API tokens for persistent access.","summary":"Vikunja, an open-source task manager, fails to check session and account status for some tokens, so a revoked token still authenticates. An attacker holding a stolen token can keep access after logout, password reset or account disabling, including by minting new OAuth sessions or tk_ API tokens.","severity":"high","cvss":7.6,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["package","self-hosted","vikunja"],"not_affected_if":["version-2.7.1-or-later"],"how_to_check":"- Check the installed Vikunja version: `vikunja version` or the image tag in your deployment\n- Confirm whether the instance is exposed to the internet and whether OAuth login is enabled","fix":"- Vikunja: `2.7.1` and later (per the advisory title: before 2.7.1 is affected)","status":"open","published_at":"2026-11-08T02:16:42+00:00","first_seen_at":"2026-11-08T02:21:09+00:00","triaged_at":"2026-11-08T02:23:22+00:00","updated_at":"2026-11-08T02:23:22+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-11-08T02:23:22Z","model":"claude-haiku-5-5","output":{"fix":"- Vikunja: `2.7.1` and later (per the advisory title: before 2.7.1 is affected)","reach":"internet","title":"Vikunja: revoked access tokens keep working after logout or account disable","impact":"high","summary":"Vikunja, an open-source task manager, fails to check session and account status for some tokens, so a revoked token still authenticates. An attacker holding a stolen token can keep access after logout, password reset or account disabling, including by minting new OAuth sessions or tk_ API tokens.","audience":"businesses","category":"package","nicknames":[],"who_cares":["vikunja","self-hosted"],"confidence":0.6,"fix_status":"available","needs_auth":"yes","worst_case":"Attacker keeps persistent account access after the owner revokes it","analyst_note":"Confirm the affected version range and whether a vendor advisory (github.com linked) names a setting or workaround beyond upgrading.","how_to_check":"- Check the installed Vikunja version: `vikunja version` or the image tag in your deployment\n- Confirm whether the instance is exposed to the internet and whether OAuth login is enabled","plain_action":"","needs_analyst":true,"not_affected_if":["version-2.7.1-or-later"],"who_is_affected":"Teams that self-host Vikunja and rely on logout, password reset or account disabling to cut off access. Hosted or unaffected versions at or above 2.7.1 are not exposed; the sources do not say whether any other configuration changes exposure.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000707,"input_tokens":4296,"output_tokens":555,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-123528':14A,17A '-2026':13A,16A '/oauth/authorize':117C '2.7.1':74C 'access':3A,54B,86C,124C 'account':10A,35B,60B,97C,111C 'account-status':96C 'allow':82C 'api':70B,120C 'attack':47B,100C 'authent':45B,90C 'check':32B,99C 'contain':75C 'cve':12A,15A 'disabl':11A,61B,112C 'expir':79C 'fail':30B 'hold':48B 'holder':83C 'host':21B 'includ':62B 'insuffici':77C 'keep':5A,53B,89C 'logout':8A,56B,107C 'manag':29B 'mint':64B,113C 'new':65B 'oauth':66B,114C 'open':26B 'open-sourc':25B 'packag':18B 'password':57B,108C 'persist':123C 'reset':58B,109C 'revok':2A,42B,85C 'self':20B 'self-host':19B 'session':33B,67B,78C,94C,115C 'setuptokenmiddlewar':92C 'skip':93C 'sourc':27B 'status':36B,98C 'still':44B 'stolen':50B,103C 'task':28B 'tk':69B,119C 'token':4A,39B,43B,51B,71B,87C,104C,121C 'via':116C 'vikunja':1A,22B,23B,72C 'vulner':80C 'work':6A","nicknames":[],"mitigations":[],"who_affected":"Teams that self-host Vikunja and rely on logout, password reset or account disabling to cut off access. Hosted or unaffected versions at or above 2.7.1 are not exposed; the sources do not say whether any other configuration changes exposure.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["high","package","selfhosted","vikunja"],"campaign_type":null,"search_a":"'-123528':14A,17A '-2026':13A,16A 'access':3A 'account':10A 'cve':12A,15A 'disabl':11A 'keep':5A 'logout':8A 'revok':2A 'token':4A 'vikunja':1A 'work':6A","search_b":"'access':54B 'account':35B,60B 'api':70B 'attack':47B 'authent':45B 'check':32B 'disabl':61B 'fail':30B 'hold':48B 'host':21B 'includ':62B 'keep':53B 'logout':56B 'manag':29B 'mint':64B 'new':65B 'oauth':66B 'open':26B 'open-sourc':25B 'packag':18B 'password':57B 'reset':58B 'revok':42B 'self':20B 'self-host':19B 'session':33B,67B 'sourc':27B 'status':36B 'still':44B 'stolen':50B 'task':28B 'tk':69B 'token':39B,43B,51B,71B 'vikunja':22B,23B","search_c":"'/oauth/authorize':117C '2.7.1':74C 'access':86C,124C 'account':97C,111C 'account-status':96C 'allow':82C 'api':120C 'attack':100C 'authent':90C 'check':99C 'contain':75C 'disabl':112C 'expir':79C 'holder':83C 'insuffici':77C 'keep':89C 'logout':107C 'mint':113C 'oauth':114C 'password':108C 'persist':123C 'reset':109C 'revok':85C 'session':78C,94C,115C 'setuptokenmiddlewar':92C 'skip':93C 'status':98C 'stolen':103C 'tk':119C 'token':87C,104C,121C 'via':116C 'vikunja':72C 'vulner':80C","first_public_at":"2026-10-22T10:08:57+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/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-2026-123528","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123528","severity":null,"published_at":"2026-11-08T02:16:42+00:00","modified_at":"2026-11-08T02:16:42+00:00","first_seen_at":"2026-11-08T02:21:09+00:00","fetched_at":"2026-11-08T02:21:09+00:00","note":null}],"documents":[{"id":99205,"url":"https://github.com/go-vikunja/vikunja/security/advisories/GHSA-4qvp-948j-4cgv","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-10-22T10:08:57+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"},{"id":99206,"url":"https://www.vulncheck.com/advisories/vikunja-before-2.7.1-insufficient-session-expiration-via-http-token-middleware","title":"Third-party advisory: www.vulncheck.com","kind":"advisory","source":"nvd","publisher":"research","text":null,"published_at":null,"relation":"advisory","confidence":null,"note":"Third-party advisory: www.vulncheck.com"}],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}