Fastify Oauth2
Monthly
Login CSRF in @fastify/oauth2 versions 7.2.0 through 8.2.x allows an attacker controlling a sibling subdomain to plant predictable OAuth state and PKCE code verifier cookies, silently signing a victim into the attacker's account instead of their own. The root cause is the absence of server-side session binding and cookie prefixing - the plugin validates OAuth state exclusively by comparing callback parameters against unprefixed cookies, which sibling subdomains sharing the same registrable domain can freely overwrite. No active exploitation has been confirmed (not in CISA KEV) and no public proof-of-concept exists; the high attack complexity limits opportunistic risk.
Login CSRF in @fastify/oauth2 versions 7.2.0 through 8.2.x allows an attacker controlling a sibling subdomain to plant predictable OAuth state and PKCE code verifier cookies, silently signing a victim into the attacker's account instead of their own. The root cause is the absence of server-side session binding and cookie prefixing - the plugin validates OAuth state exclusively by comparing callback parameters against unprefixed cookies, which sibling subdomains sharing the same registrable domain can freely overwrite. No active exploitation has been confirmed (not in CISA KEV) and no public proof-of-concept exists; the high attack complexity limits opportunistic risk.