CVE-2026-39912

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Source

https://cve.org/CVERecord?id=CVE-2026-39912

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-39912.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-39912

Published

2026-04-09T18:35:35Z

Modified

2026-08-12T03:51:41Z

Severity

9.1 (Critical) CVSS_V4 - 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 CVSS Calculator

Summary

v2board / Xboard Authentication Token Exposure via loginWithMailLink

Details

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.

Database specific

{
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
        "CWE-201"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39912.json",
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "introduced": "bdb10bed32c5f37df2f0872c3cb354e9b7a293bd"
                },
                {
                    "last_affected": "0ca47622a50116d0ddd7ffb316b157afb57d25e8"
                }
            ],
            "source": "AFFECTED_FIELD"
        }
    ]
}

References

Affected packages

Git / github.com/cedar2025/xboard

Affected ranges

Type

GIT

Repo

https://github.com/cedar2025/xboard

Events

Introduced

Fixed

3c224f3ad814afea4fa3b16435a090d884c1d709

Fixed

121511523f04882ec0c7447acd9b8ebcb8a47957

Database specific

Show details

{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.1.9"
        }
    ],
    "source": [
        "DESCRIPTION",
        "REFERENCES"
    ]
}

Type

GIT

Repo

https://github.com/v2board/v2board

Events

Introduced

1a0b09edd248ab5608df96d1f0da6fc7019cda50

Fixed

0ca47622a50116d0ddd7ffb316b157afb57d25e8

Database specific

Show details

{
    "extracted_events": [
        {
            "introduced": "1.6.1"
        },
        {
            "last_affected": "1.7.4"
        },
        {
            "fixed": "1.7.4"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "DESCRIPTION"
    ]
}

Affected versions

1.*

1.6.1

1.7.0

1.7.1

1.7.2

1.7.3

v0.*

v0.1.3

v0.1.4

v0.1.5

v0.1.6

v0.1.7

v0.1.8

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-39912.json"