CVE-2026-39912

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.58% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 45.6% of scored records. A rank, not a probability.

NVD base score

9.1 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS 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/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

NVD analysis status

Deferred. NVD last modified this record on 2026-07-14.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-04-09 18:35Z4 MO AGO

Last updated

2026-07-14 20:00Z1 MO AGO

Reserved

2026-04-07

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

Critical (CVSS 9.1)

CNA CVSS 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

Weaknesses

• CWE-201Insertion of Sensitive Information Into Sent DataBase

Data version

5.2

Document digest

8ee0c6b6fb7391bbd68e366fe4539762bd0589c570d32baf2b975368f6bded9d

• chocapikk.comhttps://chocapikk.com/posts/2026/xboard-v2board-account-takeover/technical-descriptionexploit
• github.comhttps://github.com/v2board/v2board/pull/981issue-tracking
• github.comhttps://github.com/cedar2025/Xboard/pull/873issue-tracking
• github.comhttps://github.com/v2board/v2board/blob/0ca47622a50116d0ddd7ffb316b157afb57d25e8/app/Http/Controllers/Passport/AuthController.php#L71related
• github.comhttps://github.com/cedar2025/Xboard/blob/1fe6531924cc1ec662a88b9ef725afcf78d660bc/app/Services/Auth/MailLinkService.php#L49related
• github.comhttps://github.com/cedar2025/Xboard/blob/1fe6531924cc1ec662a88b9ef725afcf78d660bc/app/Http/Controllers/V1/Passport/AuthController.php#L51related
• github.comhttps://github.com/cedar2025/Xboard/commit/121511523f04882ec0c7447acd9b8ebcb8a47957patch
• www.vulncheck.comhttps://www.vulncheck.com/advisories/v2board-xboard-authentication-token-exposure-via-loginwithmaillinkthird-party-advisory