CVE-2026-49454— Relyra SAML SignatureValue not cryptographically verified -> authentication bypass
Possible ATT&CK Techniques 1AI
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I. Basic Information for CVE-2026-49454
Vulnerability Information
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Vulnerability Title
Relyra SAML SignatureValue not cryptographically verified -> authentication bypass
Source: NVD (National Vulnerability Database)
Vulnerability Description
Relyra is a strict-by-default SAML 2.0 Service Provider library for Elixir and Phoenix. Versions 1.0.0 and 1.1.0 accept forged SAML signatures because SignatureValue was not cryptographically verified before the library returned a successful authentication result. The XMLDSig trust boundary was incomplete as :public_key.verify over the exclusive-C14N canonicalized SignedInfo was not performed against the configured IdP certificate's public key, DigestValue was not recomputed over the canonicalized referenced element, and canonicalize/2 remained an unused passthrough in the signature-verification path. The result was a structure-only acceptance path where document shape and trust-source rejection could succeed without proving the signature bytes. A forged SignatureValue carrying an attacker-controlled NameID could be accepted as {:ok}. This issue has been fixed in version 1.2.0.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
认证机制不恰当
Source: NVD (National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-49454
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Patches & Fixes for CVE-2026-49454 (2)
Vendor Advisories for CVE-2026-49454 (1)
IV. Related Vulnerabilities
Same weakness: CWE-287
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V. Comments for CVE-2026-49454
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