CVE-2026-39912 v2board / Xboard Authentication Token Exposure via loginWithMailLink

V2Board 1.6.1 through 1.7.4 and Xboard through 0.1.9 expose authentication tokens in HTTP response bodies of the loginWithMailLink endpoint when the loginwithmaillinkenable feature is active. Unauthenticated attackers can POST to the loginWithMailLink endpoint with a known email address to receiv...