CVE-2018-7644

HIGH7.5EPSS 0.21%

SimpleSAMLphp Improper Verification of Cryptographic Signature

Published: 5/13/2022Modified: 4/28/2026

Also known as:GHSA-923w-2xv2-7pr8DEBIAN-CVE-2018-7644

Description

The XmlSecLibs library as used in the saml2 library in SimpleSAMLphp before 1.15.3 incorrectly verifies signatures on SAML assertions, allowing a remote attacker to construct a crafted SAML assertion on behalf of an Identity Provider that would pass as cryptographically valid, thereby allowing them to impersonate a user from that Identity Provider, aka a key confusion issue.

Affected packages (2)

Debian/simplesamlphpfrom 0, < 1.15.3-1
Packagist/simplesamlphp/saml2from 0, < 1.10.5

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	HIGH7.5	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References (5)

ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2018-7644
ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2018-7644
PATCHhttps://github.com/simplesamlphp/simplesamlphp
WEBhttps://github.com/FriendsOfPHP/security-advisories/blob/master/simplesamlphp/saml2/CVE-2018-7644.yaml
WEBhttps://simplesamlphp.org/security/201802-01