{"cve":"CVE-2020-26290","nvd":{"published":"2020-12-28T20:15:12.493","modified":"2026-06-17T03:08:00.583","status":"Modified","description":"Dex is a federated OpenID Connect provider written in Go. In Dex before version 2.27.0 there is a critical set of vulnerabilities which impacts users leveraging the SAML connector. The vulnerabilities enables potential signature bypass due to issues with XML encoding in the underlying Go library. The vulnerabilities have been addressed in version 2.27.0 by using the xml-roundtrip-validator from Mattermost (see related references).","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","score":9.6},"cwes":["CWE-347"],"references":["https://github.com/dexidp/dex/commit/324b1c886b407594196113a3dbddebe38eecd4e8","https://github.com/dexidp/dex/releases/tag/v2.27.0","https://github.com/dexidp/dex/security/advisories/GHSA-m9hp-7r99-94h5","https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-attributes.md","https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-directives.md"],"products":["linuxfoundation:dex"],"source":"nvd","synced_at":"2026-10-19T21:12:09.559580076+00:00"},"epss":{"cve":"CVE-2020-26290","score":0.00989,"percentile":0.62513,"date":"2026-11-01"},"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."]}