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THREAT OPS › Threat News › [NVD] CVE-2026-59243 (CRITICAL 9.8) — The FAB auth manager's Azure AD OAuth login defaulted `verify_signature=False` when decoding the ID token, so an attacker able to present a forged or unsigned (`alg:none`) ID token to the OAuth callback could bypass authentication and log in as an arbitrary user, including one ho

[NVD] CVE-2026-59243 (CRITICAL 9.8) — The FAB auth manager's Azure AD OAuth login defaulted `verify_signature=False` when decoding the ID token, so an attacker able to present a forged or unsigned (`alg:none`) ID token to the OAuth callback could bypass authentication and log in as an arbitrary user, including one ho

lownvdPublished 2026-07-29

CVE-2026-59243 CVSS: 9.8 CRITICAL Published: 2026-07-29T10:16:44.390

The FAB auth manager's Azure AD OAuth login defaulted `verify_signature=False` when decoding the ID token, so an attacker able to present a forged or unsigned (`alg:none`) ID token to the OAuth callback could bypass authentication and log in as an arbitrary user, including one holding the Admin role (CWE-347). Deployments runnin

Indicators of compromise

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-59243