AshAuthentication vulnerable to OAuth2/OIDC account takeover via email-based user matching

Date Aug 25, 2026

Type Vendor advisory

Signal Critical vendor advisory

Vendor / Product erlang · ash_authentication

CVE CVE-2026-49757

Critical vendor advisory CVE-2026-49757

Summary

AshAuthentication vulnerable to OAuth2/OIDC account takeover via email-based user matching

Why it matters

GitHub has published a reviewed security advisory for ash_authentication. Prioritize it with other application dependency updates, especially because EPSS places it in the 47% percentile.

Operator check

Check whether ash_authentication is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available. CVSS score: 9.2. EPSS probability: 0.6%; percentile: 47%.

Sources

GitHub Advisory GHSA-777c-2fxx-qr28 NVD — CVE-2026-49757 Source reference

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.

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