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CVE-2026-49454— Relyra SAML SignatureValue not cryptographically verified -> authentication bypass

CVSS 9.1 · Critical EPSS 0.14% · P3

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProductVersion RangeStatus
szTheoryrelyra>= 1.0.0, < 1.2.0affected
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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)
Vulnerability Title
szTheory relyra 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
szTheory relyra是szTheory个人开发者的一款服务器软件与网络产品。 szTheory relyra 1.0.0版本和1.1.0版本存在安全漏洞，该漏洞源于XMLDSig信任边界不完整，未对SignatureValue进行加密验证，导致接受伪造SAML签名，可能导致攻击者控制NameID。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
szTheoryrelyra >= 1.0.0, < 1.2.0 -

II. Public POCs for CVE-2026-49454

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 9310 chars
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III. Intelligence Information 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

V. Comments for CVE-2026-49454

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