{"cve":"CVE-2020-27847","nvd":{"published":"2021-05-28T11:15:07.703","modified":"2026-06-17T03:09:44.013","status":"Modified","description":"A vulnerability exists in the SAML connector of the github.com/dexidp/dex library used to process SAML Signature Validation. This flaw allows an attacker to bypass SAML authentication. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability. This flaw affects dex versions before 2.27.0.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-228"],"references":["https://bugzilla.redhat.com/show_bug.cgi?id=1907732","https://github.com/dexidp/dex/security/advisories/GHSA-m9hp-7r99-94h5","https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/","https://bugzilla.redhat.com/show_bug.cgi?id=1907732","https://github.com/dexidp/dex/security/advisories/GHSA-m9hp-7r99-94h5"],"products":["linuxfoundation:dex"],"source":"nvd","synced_at":"2026-10-19T21:18:09.669877188+00:00"},"epss":{"cve":"CVE-2020-27847","score":0.01718,"percentile":0.77448,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-2x32-jm95-2cpx","url":"https://osv.dev/vulnerability/GHSA-2x32-jm95-2cpx","summary":"Authentication Bypass in dex","modified":"2026-09-10T03:49:10.072897849Z","packages":[{"ecosystem":"Go","name":"github.com/dexidp/dex","purl":"pkg:golang/github.com/dexidp/dex","ranges":["<2.27.0"],"fixed":["2.27.0"]}]},{"id":"GHSA-m9hp-7r99-94h5","url":"https://osv.dev/vulnerability/GHSA-m9hp-7r99-94h5","summary":"Critical security issues in XML encoding in github.com/dexidp/dex","modified":"2026-09-10T03:49:10.271017587Z","packages":[{"ecosystem":"Go","name":"github.com/dexidp/dex","purl":"pkg:golang/github.com/dexidp/dex","ranges":["<2.27.0"],"fixed":["2.27.0"]},{"ecosystem":"Go","name":"github.com/russellhaering/goxmldsig","purl":"pkg:golang/github.com/russellhaering/goxmldsig","ranges":["<1.1.0"],"fixed":["1.1.0"]}]}],"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."]}