CVE-2020-27847

CRITICAL9.8EPSS 0.36%

Authentication Bypass in dex

Published: 12/20/2021Modified: 3/13/2026

Also known as:GHSA-2x32-jm95-2cpxCGA-f5jj-g95c-75vxGO-2020-0050

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.

Affected packages (1)

Go/github.com/dexidp/dexfrom 0, < 2.27.0

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	CRITICAL9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References (4)

ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2020-27847
WEBhttps://bugzilla.redhat.com/show_bug.cgi?id=1907732
WEBhttps://github.com/dexidp/dex/security/advisories/GHSA-m9hp-7r99-94h5
WEBhttps://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities