CVE-2018-7644

7.5 highEPSS 1.5%

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.

Severity

CVSS 3.0

7.5 high

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS: 1.5% chance of exploitation in the next 30 days; higher than 73% of CVEs (scores of 2026-10-31)
CWE: CWE-347
Published: 2018-03-05
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

simplesamlphp:simplesamlphp

References

https://simplesamlphp.org/security/201802-01
https://simplesamlphp.org/security/201802-01

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