{"cve":"CVE-2026-91980","nvd":{"published":"2026-09-15T16:17:54.940","modified":"2026-09-16T19:49:18.987","status":"Deferred","description":"vikunja before 2.6.0 fails to validate team access when attaching teams to projects, allowing authenticated users to enumerate all teams and members. Attackers can attach arbitrary team IDs via the project teams endpoint to retrieve complete team rosters including member names and admin flags for unauthorized teams.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","score":5.3},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","score":4.3},"cwes":["CWE-200"],"references":["https://github.com/go-vikunja/vikunja/security/advisories/GHSA-39p5-2wrr-xh29","https://www.vulncheck.com/advisories/vikunja-before-2.6.0-team-enumeration-via-project-share","https://github.com/go-vikunja/vikunja/security/advisories/GHSA-39p5-2wrr-xh29"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:53:43.293028046+00:00"},"epss":{"cve":"CVE-2026-91980","score":0.00306,"percentile":0.23445,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-39p5-2wrr-xh29","url":"https://osv.dev/vulnerability/GHSA-39p5-2wrr-xh29","summary":"Vikunja: Any user can enumerate every team and its members by attaching arbitrary teams to a throwaway project","modified":"2026-10-19T21:41:05.996463332Z","packages":[{"ecosystem":"Go","name":"code.vikunja.io/api","purl":"pkg:golang/code.vikunja.io/api","ranges":["<2.6.0"],"fixed":["2.6.0"]}]},{"id":"GO-2026-6713","url":"https://osv.dev/vulnerability/GO-2026-6713","summary":"Vikunja: Any user can enumerate every team and its members by attaching arbitrary teams to a throwaway project in code.vikunja.io/api","modified":"2026-10-19T21:31:36.959604936Z","packages":[{"ecosystem":"Go","name":"code.vikunja.io/api","purl":"pkg:golang/code.vikunja.io/api","ranges":["all versions"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}