{"id":"CVE-2026-123531","kind":"vulnerability","aliases":["CVE-2026-123531"],"related":[],"title":"Vikunja: page=0 bypasses item limit, letting users exhaust server resources","description":"Vikunja from 1.0.0 before 2.7.1 contains an uncontrolled resource consumption vulnerability that allows authenticated users to bypass service.maxitemsperpage by sending page=0 to /api/v1 list endpoints. Attackers can self-register and repeatedly request page=0 to force unbounded SQL queries, memory materialisation, and per-row query fan-out, degrading availability for other users.","summary":"Vikunja, a self-hosted task manager, lets any logged-in user skip its per-page item limit by sending page=0 to its list API endpoints. Repeated requests force huge database queries and memory use, slowing the service down for other users.","severity":"high","cvss":8.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["package","self-hosted","vikunja"],"not_affected_if":["2.7.1-or-later","auth-required","managed-hosting"],"how_to_check":"- Check the Vikunja version with `vikunja version` or the About page; affected releases are from `1.0.0` before `2.7.1`.\n- Check whether open self-registration is enabled in the Vikunja config (`service.enableregistration`).","fix":"- Upgrade Vikunja to `2.7.1` or later.","status":"open","published_at":"2026-11-08T02:16:43+00:00","first_seen_at":"2026-11-08T02:21:09+00:00","triaged_at":"2026-11-08T02:22:42+00:00","updated_at":"2026-11-08T02:22:42+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-11-08T02:22:42Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade Vikunja to `2.7.1` or later.","reach":"network","title":"Vikunja: page=0 bypasses item limit, letting users exhaust server resources","impact":"low","summary":"Vikunja, a self-hosted task manager, lets any logged-in user skip its per-page item limit by sending page=0 to its list API endpoints. Repeated requests force huge database queries and memory use, slowing the service down for other users.","audience":"businesses","category":"package","nicknames":[],"who_cares":["vikunja","self-hosted"],"confidence":0.7,"fix_status":"available","needs_auth":"yes","worst_case":"Authenticated users degrade service availability for everyone else","analyst_note":"","how_to_check":"- Check the Vikunja version with `vikunja version` or the About page; affected releases are from `1.0.0` before `2.7.1`.\n- Check whether open self-registration is enabled in the Vikunja config (`service.enableregistration`).","plain_action":"","needs_analyst":false,"not_affected_if":["managed-hosting","auth-required","2.7.1-or-later"],"who_is_affected":"Teams running a self-hosted Vikunja instance from 1.0.0 before 2.7.1 are exposed, especially where anyone can self-register. Hosted or managed Vikunja services are the vendor's responsibility, and instances already on 2.7.1 or later are not affected.","user_interaction":"no","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000693,"input_tokens":4309,"output_tokens":525,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-123531':14A,17A '-2026':13A,16A '/api/v1':91C '0':3A,46B,89C,103C '1.0.0':70C '2.7.1':72C 'allow':80C 'api':50B 'attack':94C 'authent':81C 'avail':120C 'bypass':4A,84C 'consumpt':77C 'contain':73C 'cve':12A,15A 'databas':56B 'degrad':119C 'endpoint':51B,93C 'exhaust':9A 'fan':117C 'fan-out':116C 'forc':54B,105C 'host':21B,27B 'huge':55B 'item':5A,41B 'let':7A,30B 'limit':6A,42B 'list':49B,92C 'log':33B 'logged-in':32B 'manag':29B 'materialis':110C 'memori':59B,109C 'packag':18B 'page':2A,40B,45B,88C,102C 'per':39B,113C 'per-pag':38B 'per-row':112C 'queri':57B,108C,115C 'regist':98C 'repeat':52B,100C 'request':53B,101C 'resourc':11A,76C 'row':114C 'self':20B,26B,97C 'self-host':19B,25B 'self-regist':96C 'send':44B,87C 'server':10A 'servic':63B 'service.maxitemsperpage':85C 'skip':36B 'slow':61B 'sql':107C 'task':28B 'unbound':106C 'uncontrol':75C 'use':60B 'user':8A,35B,67B,82C,123C 'vikunja':1A,22B,23B,68C 'vulner':78C","nicknames":[],"mitigations":[],"who_affected":"Teams running a self-hosted Vikunja instance from 1.0.0 before 2.7.1 are exposed, especially where anyone can self-register. Hosted or managed Vikunja services are the vendor's responsibility, and instances already on 2.7.1 or later are not affected.","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":"'-123531':14A,17A '-2026':13A,16A '0':3A 'bypass':4A 'cve':12A,15A 'exhaust':9A 'item':5A 'let':7A 'limit':6A 'page':2A 'resourc':11A 'server':10A 'user':8A 'vikunja':1A","search_b":"'0':46B 'api':50B 'databas':56B 'endpoint':51B 'forc':54B 'host':21B,27B 'huge':55B 'item':41B 'let':30B 'limit':42B 'list':49B 'log':33B 'logged-in':32B 'manag':29B 'memori':59B 'packag':18B 'page':40B,45B 'per':39B 'per-pag':38B 'queri':57B 'repeat':52B 'request':53B 'self':20B,26B 'self-host':19B,25B 'send':44B 'servic':63B 'skip':36B 'slow':61B 'task':28B 'use':60B 'user':35B,67B 'vikunja':22B,23B","search_c":"'/api/v1':91C '0':89C,103C '1.0.0':70C '2.7.1':72C 'allow':80C 'attack':94C 'authent':81C 'avail':120C 'bypass':84C 'consumpt':77C 'contain':73C 'degrad':119C 'endpoint':93C 'fan':117C 'fan-out':116C 'forc':105C 'list':92C 'materialis':110C 'memori':109C 'page':88C,102C 'per':113C 'per-row':112C 'queri':108C,115C 'regist':98C 'repeat':100C 'request':101C 'resourc':76C 'row':114C 'self':97C 'self-regist':96C 'send':87C 'service.maxitemsperpage':85C 'sql':107C 'unbound':106C 'uncontrol':75C 'user':82C,123C 'vikunja':68C 'vulner':78C","first_public_at":"2026-10-22T10:09:54+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/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-2026-123531","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123531","severity":null,"published_at":"2026-11-08T02:16:43+00:00","modified_at":"2026-11-08T02:16:43+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":99211,"url":"https://github.com/go-vikunja/vikunja/security/advisories/GHSA-v579-5fwc-gr28","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-10-22T10:09:54+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"},{"id":99212,"url":"https://www.vulncheck.com/advisories/vikunja-1.0.0-before-2.7.1-pagination-limit-bypass-via-page-0-parameter","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"}