What is CVE-2026-49454?

CVE-2026-49454 is a critical-severity vulnerability in Sztheory Relyra, classified under Improper Authentication. CVSS score: 9.1/10. Published 2026-06-18.

How severe is CVE-2026-49454?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Auth bypass in Sztheory Relyra

CVE-2026-49454

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 successf…

Vulnerability class: Broken Authentication

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Sztheory Relyra — versions >= 1.0.0, < 1.2.0

Weakness classification (CWE)

CWE-287 — Improper Authentication
CWE-347 — Improper Verification of Cryptographic Signature

References

security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-49454?: CVE-2026-49454 is a critical-severity vulnerability in Sztheory Relyra, classified under Improper Authentication. CVSS score: 9.1/10. Published 2026-06-18.
How severe is CVE-2026-49454?: Critical severity. CVSS v3 base score is 9.1 out of 10.