CVE-2026-3456-OAuth2-PKCE-Race-Condition-Account-Takeover-

8. CVE-2026-3456 – OAuth2 PKCE Race Condition Account Takeover Overview A race condition in the OAuth2 authorization server allows an attacker to reuse a victim’s authorization code before the legitimate client redeems it, by guessing or brute‑forcing the PKCE codeverifier within a small time...