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Vulnerability record · CVE-2017-18122 · published 2 February 2018

CVE-2017-18122: Simplesamlphp improper verification of cryptographic signature vulnerability

SSimplesamlphp · Simplesamlphp

A signature-validation bypass issue was discovered in SimpleSAMLphp through 1.14.16. A SimpleSAMLphp Service Provider using SAML 1.1 will regard as valid any unsigned SAML response containing more than one signed assertion, provided that the signature of at least one of the assertions is valid. Attributes contained in all the assertions received will be merged and the entityID of the first assertion received will be used, allowing an attacker to impersonate any user of any IdP given an assertion signed by the targeted IdP.

8.1 CVSS 3.0 High EPSS 1.1% · top 35.9% CWE-347 · Improper verification of cryptographic signature
8.1CVSS 3.0 base score, v2 6.8
1.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

A signature-validation bypass issue was discovered in SimpleSAMLphp through 1.14.16. A SimpleSAMLphp Service Provider using SAML 1.1 will regard as valid any unsigned SAML response containing more than one signed assertion, provided that the signature of at least one of the assertions is valid. Attributes contained in all the assertions received will be merged and the entityID of the first assertion received will be used, allowing an attacker to impersonate any user of any IdP given an assertion signed by the targeted IdP.

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

Affected products

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

References

LinkTags
https://lists.debian.org/debian-lts-announce/2018/02/msg00008.html Mailing ListThird Party Advisory
https://simplesamlphp.org/security/201710-01 PatchVendor Advisory
https://www.debian.org/security/2018/dsa-4127 Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/02/msg00008.html Mailing ListThird Party Advisory
https://simplesamlphp.org/security/201710-01 PatchVendor Advisory
https://www.debian.org/security/2018/dsa-4127 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2017-18122), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.