{"affected":[{"defaultStatus":"unaffected","ecosystem":"golang","packageName":"code.vikunja.io/api","product":"vikunja","source":"CNA: VulnCheck","vendor":"go-vikunja","versions":[{"lessThan":"2.7.1","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"2.7.1","versionType":"semver"}]}],"cveId":"CVE-2026-123526","cwes":["CWE-915"],"description":"Vikunja before 2.7.1 contains a mass assignment vulnerability that allows any authenticated user to set the read-only external_id field through the team create and update endpoints. Attackers can tag a team they create or administer as externally managed, permanently blocking removal of every member and causing SSO members to be dropped from the team at their next login.","epss":{"date":"2026-11-09","percentile":0.17323,"score":0.00256},"exploits":[{"kind":"exploit","source":"ADP: CISA-ADP","url":"https://github.com/go-vikunja/vikunja/security/advisories/GHSA-fjrf-gjmg-9v6g"}],"kev":null,"metrics":[{"score":5.3,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N","version":"4.0"},{"score":5.4,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L","version":"3.1"},{"score":5.3,"severity":"medium","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/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","version":"4.0"},{"score":5.4,"severity":"medium","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L","version":"3.1"}],"modifiedAt":1794233111374,"publishedAt":1794101855608,"references":[{"source":"CNA: VulnCheck","tags":["vendor-advisory"],"url":"https://github.com/go-vikunja/vikunja/security/advisories/GHSA-fjrf-gjmg-9v6g"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/vikunja-before-2.7.1-mass-assignment-via-team-external-id-field"},{"source":"ADP: CISA-ADP","tags":["exploit"],"url":"https://github.com/go-vikunja/vikunja/security/advisories/GHSA-fjrf-gjmg-9v6g"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/go-vikunja/vikunja/security/advisories/GHSA-fjrf-gjmg-9v6g"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://www.vulncheck.com/advisories/vikunja-before-2.7.1-mass-assignment-via-team-external-id-field"}],"remediation":[],"revision":"e8d5f36bf0960aa86de47c310ce68ee2233fb9fb2bd62f16978462a2f3561ca5","sources":[{"modifiedAt":1794233111374,"name":"CNA: VulnCheck","retrievedAt":1794233345802,"url":"https://www.cve.org/CVERecord?id=CVE-2026-123526"},{"modifiedAt":1794104202437,"name":"NVD","retrievedAt":1794118569071,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123526"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794237015915,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-123526"}],"ssvc":{"assessedAt":1794233075414,"automatable":"no","exploitation":"poc","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"Vikunja before 2.7.1 Mass Assignment via Team external_id Field","updatedAt":1794237015915}