Improper Verification of Cryptographic Signature vulnerability in erlef oidcc allows an unauthenticated attacker to impersonate an arbitrary user via an encrypted ID token or JARM response carrying no nested signature.
CVSS 4.0HIGH 7.6·Network·No auth·User interaction·EPSS 0.00216·Published 2026-08-30·Fixed in 3.9.0CWE-347