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Vulnerability record · CVE-2023-49087 · published 30 November 2023

CVE-2023-49087: Simplesamlphp saml2 insufficient verification of data authenticity vulnerability

SSimplesamlphp · Saml2

xml-security is a library that implements XML signatures and encryption. Validation of an XML signature requires verification that the hash value of the related XML-document matches a specific DigestValue-value, but also that the cryptographic signature on the SignedInfo-tree (the one that contains the DigestValue) verifies and matches a trusted public key. If an attacker somehow (i.e. by exploiting a bug in PHP's canonicalization function) manages to manipulate the canonicalized version's DigestValue, it would be possible to forge the signature. This issue has been patched in version 1.6.12 and 5.0.0-alpha.13.

7.5 CVSS 3.1 High EPSS 0.19% · top 92.0% CWE-345 · Insufficient verification of data authenticity
7.5CVSS 3.1 base score
0.19%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

xml-security is a library that implements XML signatures and encryption. Validation of an XML signature requires verification that the hash value of the related XML-document matches a specific DigestValue-value, but also that the cryptographic signature on the SignedInfo-tree (the one that contains the DigestValue) verifies and matches a trusted public key. If an attacker somehow (i.e. by exploiting a bug in PHP's canonicalization function) manages to manipulate the canonicalized version's DigestValue, it would be possible to forge the signature. This issue has been patched in version 1.6.12 and 5.0.0-alpha.13.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

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

References

LinkTags
https://github.com/simplesamlphp/xml-security/commit/f509e3083dd7870cce5880c804b5122317287581 Patch
https://github.com/simplesamlphp/xml-security/security/advisories/GHSA-ww7x-3gxh-qm6r ExploitVendor Advisory
https://github.com/simplesamlphp/xml-security/commit/f509e3083dd7870cce5880c804b5122317287581 Patch
https://github.com/simplesamlphp/xml-security/security/advisories/GHSA-ww7x-3gxh-qm6r ExploitVendor Advisory

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Related vulnerabilities

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

9.1CVE-2016-9814Simplesamlphp vulnerabilityThe validateSignature method in the SAML2\Utils class in SimpleSAMLphp before 1.14.10 and simplesamlphp/saml2 library before 1.9.1, 1.10.x before 1.1…EPSS 2.4%8.2CVE-2026-32600Simplesamlphp xml-security vulnerabilityxml-security is a library that implements XML signatures and encryption. Prior to versions 2.3.1 and 1.13.9, XML nodes encrypted with either aes-128-…EPSS 0.17%8.1CVE-2018-7711Simplesamlphp improper verification of cryptographic signature vulnerabilityHTTPRedirect.php in the saml2 library in SimpleSAMLphp before 1.15.4 has an incorrect check of return values in the signature validation utilities, a…EPSS 1.2%7.5CVE-2018-6519Simplesamlphp saml2 injection vulnerabilityThe SAML2 library before 1.10.4, 2.x before 2.3.5, and 3.x before 3.1.1 in SimpleSAMLphp has a Regular Expression Denial of Service vulnerability for…EPSS 1.7%7.8CVE-2023-38831WinRAR ZIP archive spoofing leads to arbitrary code executionWinRAR before 6.23 mishandles ZIP archives that contain a benign file and a folder with the same name, causing the folder's contents to be processed …KEVEPSS 100%analysed9.8CVE-2022-26871Trend Micro Apex Central unauthenticated arbitrary file uploadTrend Micro Apex Central (and Apex One) contains an arbitrary file upload flaw caused by insufficient verification of data authenticity (CWE-345). An…KEVEPSS 19%analysed

Source: NIST National Vulnerability Database (record CVE-2023-49087), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.