Feast through 0.66.0 Authentication Bypass via Unverified Token

Advisories

Feast through 0.66.0 Authentication Bypass via Unverified Token

severity: critical
date: 9/16/2026
Affecting: feast <= 0.66.0
CVE: CVE-2026-92787
CWE: CWE-798 Use of Hard-coded Credentials
CVSS: 9.3
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
References: GitHub Issue #6785
https://github.com/feast-dev/feast
is_auth_necessary skips all permission checks for the intra-communication identity
the identity is taken from an explicitly unverified JWT decode
the Helm chart hardcodes the trusted value
Credit: George Chen
Description: Feast through 0.66.0 fails to verify JWT token signatures before establishing user identity, allowing attackers to bypass all role-based access control by presenting an unverified token with a hardcoded claim value. Attackers can obtain trusted internal identity and gain unchecked read and write access to all entities, feature views, data sources, and permission policies on the server.

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