What’s Vulnerable › Vulnerabilities

CVE-2023-49087: Validation of SignedInfo

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-11-30 · updated 2026-06-17
• Weakness: CWE-345

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.

Affected products

• simplesamlphp saml2: 5.0.0-alpha12
• simplesamlphp xml-security: 1.6.11

References

• https://github.com/simplesamlphp/xml-security/commit/f509e3083dd7870cce5880c804b5122317287581
• https://github.com/simplesamlphp/xml-security/security/advisories/GHSA-ww7x-3gxh-qm6r
• https://github.com/simplesamlphp/xml-security/commit/f509e3083dd7870cce5880c804b5122317287581
• https://github.com/simplesamlphp/xml-security/security/advisories/GHSA-ww7x-3gxh-qm6r

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