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CVE-2026-39912 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:7.4 HIGHVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CNA: [email protected]CVSS-B:9.1 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://chocapikk.com/posts/2026/xboard-v2board-account-takeover/	[email protected]	ExploitRemedyTechnical Analysis
https://github.com/cedar2025/Xboard/blob/1fe6531924cc1ec662a88b9ef725afcf78d660bc/app/Http/Controllers/V1/Passport/AuthController.php#L51	[email protected]	Source CodeVendor
https://github.com/cedar2025/Xboard/blob/1fe6531924cc1ec662a88b9ef725afcf78d660bc/app/Services/Auth/MailLinkService.php#L49	[email protected]	Source CodeVendor
https://github.com/cedar2025/Xboard/commit/121511523f04882ec0c7447acd9b8ebcb8a47957	[email protected]	Source CodeVendor
https://github.com/cedar2025/Xboard/pull/873	[email protected]	Issue TrackingVendor
https://github.com/v2board/v2board/blob/0ca47622a50116d0ddd7ffb316b157afb57d25e8/app/Http/Controllers/Passport/AuthController.php#L71	[email protected]	Source CodeVendor
https://github.com/v2board/v2board/pull/981	[email protected]	Issue TrackingVendor
https://www.vulncheck.com/advisories/v2board-xboard-authentication-token-exposure-via-loginwithmaillink	[email protected]

see all 8 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-201	Insertion of Sensitive Information Into Sent Data	[email protected]

Affected Products

Product	Versions
V2Board	All versions
CPE No CPEs found in CPE dictionary for this product. Remediation No remediation found in references.
Xboard	All versions
CPE No CPEs found in CPE dictionary for this product. Remediation No remediation found in references.

Change History

4 change records found show changes

Date	Action	Recorded By
Jul 14, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Apr 9, 2026	New CVE Received	[email protected]