{"cve":"CVE-2026-91972","nvd":{"published":"2026-09-15T16:17:54.087","modified":"2026-09-17T16:18:32.093","status":"Deferred","description":"Vikunja versions before 2.6.0 fail to apply rate limiting to /api/v2 public authentication endpoints including login, register, password-reset, and OAuth token routes. Remote unauthenticated attackers can perform unbounded credential guessing, account enumeration, and password-reset flooding attacks without throttling restrictions.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","score":8.7},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5},"cwes":["CWE-307"],"references":["https://github.com/go-vikunja/vikunja/security/advisories/GHSA-6rvj-qwjf-3m4q","https://www.vulncheck.com/advisories/vikunja-before-2.6.0-authentication-bypass-via-unthrottled-api","https://github.com/go-vikunja/vikunja/security/advisories/GHSA-6rvj-qwjf-3m4q"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:53:43.293028046+00:00"},"epss":{"cve":"CVE-2026-91972","score":0.00633,"percentile":0.5037,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-6rvj-qwjf-3m4q","url":"https://osv.dev/vulnerability/GHSA-6rvj-qwjf-3m4q","summary":"Vikunja: Every /api/v2 pre-auth endpoint is unthrottled on a stock install while its /api/v1 twin is rate limited","modified":"2026-10-19T21:41:17.124911538Z","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-2026-6721","url":"https://osv.dev/vulnerability/GO-2026-6721","summary":"Vikunja: Every /api/v2 pre-auth endpoint is unthrottled on a stock install while its /api/v1 twin is rate limited in code.vikunja.io/api","modified":"2026-10-19T21:31:52.274584795Z","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."]}