{"id":"CVE-2026-91983","title":"Vikunja before 2.6.0 contains an API token scope bypass vulnerability in task read endpoints where authorization fails to inspect query string parameters","summary":"Vikunja before 2.6.0 contains an API token scope bypass vulnerability in task read endpoints where authorization fails to inspect query string parameters. Attackers with limited token scopes can use the expand parameter to access restric…","severity":"medium","cvss":4.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","cwe":["CWE-863"],"vendor":"go-vikunja","product":"vikunja","affected":["vikunja >= 1.0.0 < 2.6.0"],"published":"2026-09-15","updated":"2026-09-16","sourceUpdated":"2026-09-16T20:16:09.343","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-91983","references":[{"url":"https://github.com/go-vikunja/vikunja/security/advisories/GHSA-9rg3-v78m-26q8","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/vikunja-before-2.6.0-api-token-scope-bypass-via-expand-parameter","label":"disclosure@vulncheck.com"},{"url":"https://github.com/go-vikunja/vikunja/security/advisories/GHSA-9rg3-v78m-26q8","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-15T15:51:30.464514Z"},"ingestedAt":"2026-09-15T15:39:12.910Z","epss":0.0027,"epssPercentile":0.19452,"slug":"CVE-2026-91983","body":"## Overview\n\nVikunja before 2.6.0 contains an API token scope bypass vulnerability in task read endpoints where authorization fails to inspect query string parameters. Attackers with limited token scopes can use the expand parameter to access restricted data like comments, reactions, and time entries without proper permission verification.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":36,"depthScoreParts":{"impact":23.7,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":204288,"id":"CVE-2026-91983","ts":1789490447327,"field":"exploit_available","old":"false","new":"true"}]}