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.
Published: 2026-04-09
Score: 9.1 Critical
EPSS: < 1% Very Low
KEV: No
Impact: Account Takeover
Action: Immediate Patch
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Mon, 13 Apr 2026 16:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Fri, 10 Apr 2026 09:00:00 +0000

Type Values Removed Values Added
First Time appeared Cedar2025
Cedar2025 xboard
V2board
V2board v2board
Vendors & Products Cedar2025
Cedar2025 xboard
V2board
V2board v2board

Thu, 09 Apr 2026 19:00:00 +0000

Type Values Removed Values Added
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.
Title v2board / Xboard Authentication Token Exposure via loginWithMailLink
Weaknesses CWE-201
References
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'}

cvssV4_0

{'score': 9.1, 'vector': '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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-04-13T15:38:46.529Z

Reserved: 2026-04-07T20:57:06.209Z

Link: CVE-2026-39912

cve-icon Vulnrichment

Updated: 2026-04-10T20:17:22.820Z

cve-icon NVD

Status : Deferred

Published: 2026-04-09T19:16:25.920

Modified: 2026-04-15T15:00:32.790

Link: CVE-2026-39912

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-10T09:31:43Z

Weaknesses