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Vulnerability record · CVE-2018-7644 · published 5 March 2018

CVE-2018-7644: Simplesamlphp improper verification of cryptographic signature vulnerability

SSimplesamlphp · Simplesamlphp

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.

7.5 CVSS 3.0 High EPSS 1.2% · top 31.8% CWE-347 · Improper verification of cryptographic signature
7.5CVSS 3.0 base score, v2 5.0
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://simplesamlphp.org/security/201802-01 Vendor Advisory
https://simplesamlphp.org/security/201802-01 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2018-7644), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.