CVE-2026-49454

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.1%, top 97% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.1Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.1
EG Score
9.1(medium)
EPSS
3.3%
KEV
Not listed

Published

June 18, 2026

Last Modified

June 23, 2026

Advisory Details (3)

Auto-updated Jun 18, 2026
Patch available. Sources: github_commit, github.
github Patch Available

Relyra SAML SignatureValue not cryptographically verified -> authentication bypass · Advisory · szTheory/relyra · GitHub

https://github.com/szTheory/relyra/security/advisories/GHSA-jv46-xfwm-36j7
github_commit Patch Available

commit 8910200 (szTheory/relyra)

Patch available: szTheory/relyra v1.2.0 (contains commit 8910200)

https://github.com/szTheory/relyra/commit/8910200
github_commit Patch Available

commit 2e456897af31 (szTheory/relyra)

Patch available: szTheory/relyra v1.2.0 (contains commit 2e456897af31)

https://github.com/szTheory/relyra/commit/2e456897af3158c175bb490ce7fc51d6241c8922

Vendor Advisories for CVE-2026-49454(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 49× in last 7d / 132× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 132 total refreshes for this CVE.

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Frequently asked(5)

What is CVE-2026-49454?
CVE-2026-49454 is a critical vulnerability published on June 18, 2026. 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…
When was CVE-2026-49454 disclosed?
CVE-2026-49454 was first published in the National Vulnerability Database on June 18, 2026, with the most recent update on June 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-49454 actively exploited?
CVE-2026-49454 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-49454?
CVE-2026-49454 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-49454?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-49454, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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