CVE-2020-27847

CRITICAL 9.8CVE-2020-27847 · Published 28/05/2021 · updated 17/06/2026

In short

CVE-2020-27847 is a CRITICAL (CVSS 9.8) vulnerability affecting dex (linuxfoundation).
Chance of exploitation in the next 30 days (EPSS): 1.7%, higher than 77.5% of all vulnerabilities.
Fix: update to 2.27.0 or later.

Package	Affected versions	Patched versions
dex linuxfoundation	`< 2.27.0`	`2.27.0`

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.

References

bugzilla.redhat.com/show_bug.cgi · Issue Tracking
dexidp/dex security advisory · Patch
mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities · Vendor Advisory

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