CVE-2026-39912
CRITICAL
9,1
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: none
User Interaction: none
Confidentiality: N/A
Integrity: N/A
Availability: N/A
CRITICAL
9,1
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: none
User Interaction: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: none
Description
AI Translation Available
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.
EPSS (Exploit Prediction Scoring System)
Trend Analysis
EPSS (Exploit Prediction Scoring System)
Prevede la probabilità di sfruttamento basata su intelligence sulle minacce e sulle caratteristiche della vulnerabilità.
EPSS Score
0,0006
Percentile
0,2th
Updated
EPSS Score Trend (Last 7 Days)
201
Insertion of Sensitive Information Into Sent Data
DraftCommon Consequences
Security Scopes Affected:
Confidentiality
Potential Impacts:
Read Files Or Directories
Read Memory
Read Application Data
Applicable Platforms
All platforms may be affected
https://chocapikk.com/posts/2026/xboard-v2board-account-takeover/
https://github.com/cedar2025/Xboard/blob/1fe6531924cc1ec662a88b9ef725afcf78d660…
https://github.com/cedar2025/Xboard/blob/1fe6531924cc1ec662a88b9ef725afcf78d660…
https://github.com/cedar2025/Xboard/commit/121511523f04882ec0c7447acd9b8ebcb8a4…
https://github.com/cedar2025/Xboard/pull/873
https://github.com/v2board/v2board/blob/0ca47622a50116d0ddd7ffb316b157afb57d25e…
https://github.com/v2board/v2board/pull/981
https://www.vulncheck.com/advisories/v2board-xboard-authentication-token-exposu…