CVE-2026-39912
CriticalCVSS 9.1Exploitation Probability (EPSS)
Low risk44th percentile - higher than 44% of all known CVEs
Summary
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 login_with_mail_link_enable feature is active. Unauthenticated attackers can POST to the loginWithMailLink endpoint with a known email address to receive the full authentication URL in the response, then exchange the token at the token2Login endpoint to obtain a valid bearer token with complete account access including admin privileges.
Risk Assessment
The organization is at risk of account takeover, including administrator accounts, leading to unauthorized data access, configuration changes, and privilege escalation within the system.
Recommendation
Immediately disable the login_with_mail_link_enable feature if not required, and update V2Board to version 1.7.5 or later, and Xboard to version 0.2.0 or later once patches are released.
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Original NVD description (English source)
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 login_with_mail_link_enable feature is active. Unauthenticated attackers can POST to the loginWithMailLink endpoint with a known email address to receive the full authentication URL in the response, then exchange the token at the token2Login endpoint to obtain a valid bearer token with complete account access including admin privileges.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS