{"id":"CVE-2026-40103","aliases":["GHSA-v479-vf79-mg83","GO-2026-5650"],"url":"https://o3.security/vulnerability/CVE-2026-40103","summary":"Vikunja's Scoped API tokens with projects.background permission can delete project backgrounds","details":"Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, Vikunja's scoped API token enforcement for custom project background routes is method-confused. A token with only projects.background can successfully delete a project background, while a token with only projects.background_delete is rejected. This is a scoped-token authorization bypass. This vulnerability is fixed in 2.3.0.","published":"2026-04-10T16:12:27.603Z","modified":"2026-08-07T11:50:16.967597785Z","cvss":{"score":4.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Go","name":"code.vikunja.io/api","fixedVersion":"2.3.0"}],"fix":{"url":"https://github.com/go-vikunja/vikunja/commit/6a0f39b252a81fa4b19dc56dc889183acc9225ae","label":"go-vikunja/vikunja@6a0f39b"},"references":[{"type":"WEB","url":"https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40103.json"},{"type":"ADVISORY","url":"https://github.com/go-vikunja/vikunja/security/advisories/GHSA-v479-vf79-mg83"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40103"},{"type":"FIX","url":"https://github.com/go-vikunja/vikunja/commit/6a0f39b252a81fa4b19dc56dc889183acc9225ae"},{"type":"FIX","url":"https://github.com/go-vikunja/vikunja/pull/2584"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:50:16.967597785Z"}}