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CVE-2026-39912

CriticalPublished

v2board / Xboard Authentication Token Exposure via loginWithMailLink

Published: Apr 9, 2026
Updated: Jul 14, 2026
Assigning CNA: VulnCheck
Evidence observed: Aug 19, 2026

Primary CVSS

9.1/ 10Critical

nvd · CVSS 4.0

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS probability estimate

0.6%

Low · next 30 days

Percentile: 46.4%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

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.

Sources

CVE-2026-39912Exploit
Xboard / V2Board Unauth Account Takeover - Magic Link Token Leak (CVE-2026-39912)

Responsible use

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