{"id":"CVE-2021-39873","aliases":["BIT-gitlab-2021-39873","EUVD-2021-26230","GHSA-pgwc-r5c3-jvg2","UBUNTU-CVE-2021-39873"],"status":"published","title":"In all versions of GitLab CE/EE, there exists a content spoofing vulnerability which may be...","description":"In all versions of GitLab CE/EE, there exists a content spoofing vulnerability which may be leveraged by attackers to trick users into visiting a malicious website by spoofing the content in an error response.","severity":{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.01046,"percentile":0.64451,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"published":"2021-10-04T16:43:24Z","modified":"2026-10-30T10:30:28Z","fixes":[{"ecosystem":"Bitnami","package":"gitlab","fixed_in":["14.1.7","14.2.5","14.3.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Bitnami","package":"gitlab","ranges":[{"type":"SEMVER","events":[{"introduced":"1.0.0"},{"fixed":"14.1.7"},{"introduced":"14.2.0"},{"fixed":"14.2.5"},{"introduced":"14.3.0"},{"fixed":"14.3.1"}]}]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"gitlab","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["8.4.3+dfsg-9","8.4.3+dfsg-12","8.5.8+dfsg-5"]}],"products":[{"vendor":"gitlab","product":"gitlab"}],"references":[{"url":"https://gitlab.com/gitlab-org/gitlab/-/issues/27241","tags":["x_refsource_MISC","x_transferred","Broken Link","web","report"]},{"url":"https://hackerone.com/reports/504961","tags":["x_refsource_MISC","x_transferred","Permissions Required","Third Party Advisory","advisory","report"]},{"url":"https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39873.json","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory","advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-39873","tags":["web"]},{"url":"https://github.com/advisories/GHSA-pgwc-r5c3-jvg2"},{"url":"https://ubuntu.com/security/CVE-2021-39873","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-39873","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-39873","description":"In all versions of GitLab CE/EE, there exists a content spoofing vulnerability which may be leveraged by attackers to trick users into visiting a malicious website by spoofing the content in an error 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