{"id":"CVE-2020-12676","aliases":["EUVD-2020-4972","GHSA-qh45-328h-49g4"],"status":"published","title":"FusionAuth fusionauth-samlv2 0.2.3 allows remote attackers to forge messages and bypass...","description":"FusionAuth fusionauth-samlv2 0.2.3 allows remote attackers to forge messages and bypass authentication via a SAML assertion that lacks a Signature element, aka a \"Signature exclusion attack\".","severity":{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.0293,"percentile":0.87275,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-347"],"published":"2020-10-02T19:40:33Z","modified":"2026-06-17T02:52:07Z","products":[{"vendor":"fusionauth","product":"samlv2"}],"references":[{"url":"https://www.nds.ruhr-uni-bochum.de/media/nds/veroeffentlichungen/2012/08/22/BreakingSAML_3.pdf","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://github.com/SAMLRaider/SAMLRaider","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"http://seclists.org/fulldisclosure/2020/Oct/1","tags":["mailing-list","x_refsource_FULLDISC","x_transferred","Exploit","Mailing List","Third Party Advisory"]},{"url":"https://compass-security.com/fileadmin/Research/Advisories/2020-06_CSNC-2020-002_FusionAuth_Signature_Exclusion_Attack.txt","tags":["x_refsource_MISC","x_transferred","Exploit","Mailing List","Vendor Advisory"]},{"url":"http://packetstormsecurity.com/files/159454/FusionAuth-SAMLv2-0.2.3-Message-Forging.html","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","VDB Entry"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-12676"},{"url":"https://github.com/advisories/GHSA-qh45-328h-49g4"}],"sources":{"cve":[{"id":"CVE-2020-12676","description":"FusionAuth fusionauth-samlv2 0.2.3 allows remote attackers to forge messages and bypass authentication via a SAML assertion that lacks a Signature element, aka a \"Signature exclusion attack\".","status":"published","published":"2020-10-02T19:40:33Z","modified":"2024-08-04T12:04:22.514Z","updated_at":"2026-11-02T14:35:52.925152Z"}],"euvd":[{"id":"EUVD-2020-4972","description":"FusionAuth fusionauth-samlv2 0.2.3 allows remote attackers to forge messages and bypass authentication via a SAML assertion that lacks a Signature element, aka a \"Signature exclusion attack\".","status":"published","published":"2020-10-02T19:40:33Z","modified":"2024-08-04T12:04:22Z","updated_at":"2026-11-03T03:07:39.896975Z"}],"ghsa":[{"id":"GHSA-qh45-328h-49g4","title":"FusionAuth fusionauth-samlv2 0.2.3 allows remote attackers to forge messages and bypass...","description":"FusionAuth fusionauth-samlv2 0.2.3 allows remote attackers to forge messages and bypass authentication via a SAML assertion that lacks a Signature element, aka a \"Signature exclusion attack\".","status":"published","published":"2022-05-24T17:29:58Z","modified":"2023-01-29T05:04:02Z","cwes":["CWE-347"],"updated_at":"2026-11-02T14:45:27.507739Z"}],"nvd":[{"id":"CVE-2020-12676","description":"FusionAuth fusionauth-samlv2 0.2.3 allows remote attackers to forge messages and bypass authentication via a SAML assertion that lacks a Signature element, aka a \"Signature exclusion attack\".","status":"published","published":"2020-10-02T20:15:12.317Z","modified":"2026-06-17T02:52:07.26Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"primary"},{"version":"2.0","score":6.4,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-347"],"updated_at":"2026-11-02T14:06:17.70091Z"}]}}