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
2026-10-28T02:31:13Z
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"
}
References

Affected packages

Git / github.com/cedar2025/xboard

Affected ranges

Type
GIT
Repo
https://github.com/cedar2025/xboard
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
121511523f04882ec0c7447acd9b8ebcb8a47957
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "last_affected":  "0.1.9"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StandardRange"
        },
        {
            "range":  [
                {
                    "fixed":  "121511523f04882ec0c7447acd9b8ebcb8a47957"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        }
    ]
}
Type
GIT
Repo
https://github.com/v2board/v2board
Events
Introduced
bdb10bed32c5f37df2f0872c3cb354e9b7a293bd
Last Affected
0ca47622a50116d0ddd7ffb316b157afb57d25e8
Introduced
1a0b09edd248ab5608df96d1f0da6fc7019cda50
Last Affected
0ca47622a50116d0ddd7ffb316b157afb57d25e8
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "bdb10bed32c5f37df2f0872c3cb354e9b7a293bd"
                },
                {
                    "last_affected":  "0ca47622a50116d0ddd7ffb316b157afb57d25e8"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StandardRange"
        },
        {
            "range":  [
                {
                    "introduced":  "1.6.1"
                },
                {
                    "last_affected":  "1.7.4"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StandardRange"
        }
    ]
}

Affected versions

1.*
1.6.1
1.7.0
1.7.1
1.7.2
1.7.3
1.7.4

Database specific

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