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CVE-2026-39912
9.1 CRITICAL
- CVSS version (CVSS): 3.1
- Attack Vector (AV): Network (N)
- Attack Complexity (AC): Low (L)
- Privileges Required (PR): None (N)
- User Interaction (UI): None (N)
- Scope (S): Unchanged (U)
- Confidentiality (C): High (H)
- Integrity (I): High (H)
- Availability (A): None (N)
- Modified Attack Vector (MAV): Network (N)
- Modified Attack Complexity (MAC): Low (L)
- Modified Privileges Required (MPR): None (N)
- Modified User Interaction (MUI): None (N)
- Modified Confidentiality (MC): High (H)
- Modified Scope (MS): Unchanged (U)
- Modified Integrity (MI): High (H)
- Modified Availability (MA): None (N)
Activity log
- Created suggestion
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 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.
References
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https://www.vulncheck.com/advisories/v2board-xboard-authentication-token-exposu… third-party-advisory
Affected products
Xboard
- =<0.1.9
- ==121511523f04882ec0c7447acd9b8ebcb8a47957
v2board
- =<0ca47622a50116d0ddd7ffb316b157afb57d25e8
- =<1.7.4
Package maintainers
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@7c6f434c Michael Raskin <7c6f434c@mail.ru>