{"id":"CVE-2026-123507","kind":"vulnerability","aliases":["CVE-2026-123507"],"related":[],"title":"Vikunja: null bucket filter lets project admins crash project views","description":"Vikunja from 0.24.0 before 2.7.1 contains a nil pointer dereference vulnerability that allows project admins to break project views by saving a filter-mode bucket configuration with a null filter. Because validateProjectViewFilters skips nil entries, every subsequent read of the view panics in kanban and task collection code, returning HTTP 500 to all project members.","summary":"Vikunja is a self-hosted task and project manager. A project admin can save a filter-mode bucket configuration with a null filter, which makes every later read of that project view crash and return HTTP 500 to all project members.","severity":"medium","cvss":5.1,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["package","self-hosted","vikunja"],"not_affected_if":["single-user-instance","version-2.7.1-or-later"],"how_to_check":"- Check the Vikunja version with the server's version endpoint or the release tag you deployed; affected versions are from `0.24.0` before `2.7.1`.\n- Review which users hold project admin rights, since only they can save the bucket configuration.","fix":"- Vikunja: move to `2.7.1` or later, per the product range in the NVD record.","status":"open","published_at":"2026-11-08T02:16:38+00:00","first_seen_at":"2026-11-08T02:21:08+00:00","triaged_at":"2026-11-08T02:25:27+00:00","updated_at":"2026-11-08T02:25:27+00:00","category":"package","confidence":0.8,"triage":{"at":"2026-11-08T02:25:27Z","model":"claude-haiku-5-5","output":{"fix":"- Vikunja: move to `2.7.1` or later, per the product range in the NVD record.","reach":"network","title":"Vikunja: null bucket filter lets project admins crash project views","impact":"low","summary":"Vikunja is a self-hosted task and project manager. A project admin can save a filter-mode bucket configuration with a null filter, which makes every later read of that project view crash and return HTTP 500 to all project members.","audience":"businesses","category":"package","nicknames":[],"who_cares":["vikunja","self-hosted"],"confidence":0.8,"fix_status":"available","needs_auth":"yes","worst_case":"project views break for all members via server errors","analyst_note":"","how_to_check":"- Check the Vikunja version with the server's version endpoint or the release tag you deployed; affected versions are from `0.24.0` before `2.7.1`.\n- Review which users hold project admin rights, since only they can save the bucket configuration.","plain_action":"","needs_analyst":false,"not_affected_if":["version-2.7.1-or-later","single-user-instance"],"who_is_affected":"Self-hosted Vikunja instances from 0.24.0 before 2.7.1 where project admins can edit kanban bucket configurations. Project members are impacted when a view is broken, so teams using project views heavily should prioritize the upgrade. Instances already on 2.7.1 or later are not affected.","user_interaction":"no","needs_special_setup":"no","severity_if_unknown":"medium"},"cost_usd":0.000687,"input_tokens":4294,"output_tokens":515,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-123507':13A,16A '-2026':12A,15A '0.24.0':67C '2.7.1':69C '500':60B,116C 'admin':7A,34B,79C 'allow':77C 'break':81C 'bucket':3A,41B,90C 'code':113C 'collect':112C 'configur':42B,91C 'contain':70C 'crash':8A,56B 'cve':11A,14A 'derefer':74C 'entri':100C 'everi':49B,101C 'filter':4A,39B,46B,88C,95C 'filter-mod':38B,87C 'host':20B,27B 'http':59B,115C 'kanban':109C 'later':50B 'let':5A 'make':48B 'manag':31B 'member':64B,120C 'mode':40B,89C 'nil':72C,99C 'null':2A,45B,94C 'packag':17B 'panic':107C 'pointer':73C 'project':6A,9A,30B,33B,54B,63B,78C,82C,119C 'read':51B,103C 'return':58B,114C 'save':36B,85C 'self':19B,26B 'self-host':18B,25B 'skip':98C 'subsequ':102C 'task':28B,111C 'validateprojectviewfilt':97C 'view':10A,55B,83C,106C 'vikunja':1A,21B,22B,65C 'vulner':75C","nicknames":[],"mitigations":[],"who_affected":"Self-hosted Vikunja instances from 0.24.0 before 2.7.1 where project admins can edit kanban bucket configurations. Project members are impacted when a view is broken, so teams using project views heavily should prioritize the upgrade. Instances already on 2.7.1 or later are not affected.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["medium","package","selfhosted","vikunja"],"campaign_type":null,"search_a":"'-123507':13A,16A '-2026':12A,15A 'admin':7A 'bucket':3A 'crash':8A 'cve':11A,14A 'filter':4A 'let':5A 'null':2A 'project':6A,9A 'view':10A 'vikunja':1A","search_b":"'500':60B 'admin':34B 'bucket':41B 'configur':42B 'crash':56B 'everi':49B 'filter':39B,46B 'filter-mod':38B 'host':20B,27B 'http':59B 'later':50B 'make':48B 'manag':31B 'member':64B 'mode':40B 'null':45B 'packag':17B 'project':30B,33B,54B,63B 'read':51B 'return':58B 'save':36B 'self':19B,26B 'self-host':18B,25B 'task':28B 'view':55B 'vikunja':21B,22B","search_c":"'0.24.0':67C '2.7.1':69C '500':116C 'admin':79C 'allow':77C 'break':81C 'bucket':90C 'code':113C 'collect':112C 'configur':91C 'contain':70C 'derefer':74C 'entri':100C 'everi':101C 'filter':88C,95C 'filter-mod':87C 'http':115C 'kanban':109C 'member':120C 'mode':89C 'nil':72C,99C 'null':94C 'panic':107C 'pointer':73C 'project':78C,82C,119C 'read':103C 'return':114C 'save':85C 'skip':98C 'subsequ':102C 'task':111C 'validateprojectviewfilt':97C 'view':83C,106C 'vikunja':65C 'vulner':75C","first_public_at":"2026-10-22T10:02:51+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/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-2026-123507","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123507","severity":null,"published_at":"2026-11-08T02:16:38+00:00","modified_at":"2026-11-08T02:16:39+00:00","first_seen_at":"2026-11-08T02:21:08+00:00","fetched_at":"2026-11-08T02:21:08+00:00","note":null}],"documents":[{"id":99163,"url":"https://github.com/go-vikunja/vikunja/security/advisories/GHSA-hm4w-h7v8-ch43","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-10-22T10:02:51+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"},{"id":99164,"url":"https://www.vulncheck.com/advisories/vikunja-0.24.0-before-2.7.1-denial-of-service-via-nil-bucket-filter","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"}