{"id":"CVE-2021-4191","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-4191","generatedAt":"2026-11-05T00:29:51.939Z","title":"Private GitLab instances with restricted sign-ups may be vulnerable to user enumeration to unauthenticated users through the GraphQL API.","description":"An issue has been discovered in GitLab CE/EE affecting versions 13.0 to 14.6.5, 14.7 to 14.7.4, and 14.8 to 14.8.2. Private GitLab instances with restricted sign-ups may be vulnerable to user enumeration to unauthenticated users through the GraphQL API.","published":"2022-03-28T19:15:08.000Z","lastModified":"2026-06-17T04:19:11.000Z","status":"Modified","sourceIdentifier":"cve@gitlab.com","cvss":{"version":"3.1","score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"},"cwe":[],"affected":["gitlab/gitlab"],"epss":{"score":0.80004,"percentile":0.99614,"date":"2026-11-03","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 80.0%, higher than 100% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-4191.json","tags":["Vendor Advisory"],"source":"cve@gitlab.com"},{"url":"https://gitlab.com/gitlab-org/gitlab/-/issues/343898","tags":["Broken Link"],"source":"cve@gitlab.com"},{"url":"https://hackerone.com/reports/1089609","tags":["Permissions Required","Third Party Advisory"],"source":"cve@gitlab.com"},{"url":"https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-4191.json","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://gitlab.com/gitlab-org/gitlab/-/issues/343898","tags":["Broken Link"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://hackerone.com/reports/1089609","tags":["Permissions Required","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-4191","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}