CVE-2026-39912 (GCVE-0-2026-39912)
Vulnerability from cvelistv5 – Published: 2026-04-09 18:35 – Updated: 2026-07-14 20:00
VLAI
EPSS
VEX
Title
v2board / Xboard Authentication Token Exposure via loginWithMailLink
Summary
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.
Severity
9.1 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-10 20:16 UTC
CWE
- CWE-201 - Insertion of Sensitive Information Into Sent Data
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://chocapikk.com/posts/2026/xboard-v2board-a… | technical-descriptionexploit |
| https://github.com/v2board/v2board/pull/981 | issue-tracking |
| https://github.com/cedar2025/Xboard/pull/873 | issue-tracking |
| https://github.com/v2board/v2board/blob/0ca47622a… | related |
| https://github.com/cedar2025/Xboard/blob/1fe65319… | related |
| https://github.com/cedar2025/Xboard/blob/1fe65319… | related |
| https://github.com/cedar2025/Xboard/commit/121511… | patch |
| https://www.vulncheck.com/advisories/v2board-xboa… | third-party-advisory |
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| v2board | v2board |
Affected:
1.6.1 , ≤ 1.7.4
(semver)
Affected: bdb10bed32c5f37df2f0872c3cb354e9b7a293bd , ≤ 0ca47622a50116d0ddd7ffb316b157afb57d25e8 (git) |
guessed | |
| cedar2025 | Xboard |
Affected:
0 , ≤ 0.1.9
(semver)
Unaffected: 121511523f04882ec0c7447acd9b8ebcb8a47957 (git) |
guessed |
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"providerMetadata": {
"dateUpdated": "2026-07-14T20:00:18.922Z",
"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
"shortName": "VulnCheck"
},
"references": [
{
"tags": [
"technical-description",
"exploit"
],
"url": "https://chocapikk.com/posts/2026/xboard-v2board-account-takeover/"
},
{
"tags": [
"issue-tracking"
],
"url": "https://github.com/v2board/v2board/pull/981"
},
{
"tags": [
"issue-tracking"
],
"url": "https://github.com/cedar2025/Xboard/pull/873"
},
{
"tags": [
"related"
],
"url": "https://github.com/v2board/v2board/blob/0ca47622a50116d0ddd7ffb316b157afb57d25e8/app/Http/Controllers/Passport/AuthController.php#L71"
},
{
"tags": [
"related"
],
"url": "https://github.com/cedar2025/Xboard/blob/1fe6531924cc1ec662a88b9ef725afcf78d660bc/app/Services/Auth/MailLinkService.php#L49"
},
{
"tags": [
"related"
],
"url": "https://github.com/cedar2025/Xboard/blob/1fe6531924cc1ec662a88b9ef725afcf78d660bc/app/Http/Controllers/V1/Passport/AuthController.php#L51"
},
{
"tags": [
"patch"
],
"url": "https://github.com/cedar2025/Xboard/commit/121511523f04882ec0c7447acd9b8ebcb8a47957"
},
{
"tags": [
"third-party-advisory"
],
"url": "https://www.vulncheck.com/advisories/v2board-xboard-authentication-token-exposure-via-loginwithmaillink"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "v2board / Xboard Authentication Token Exposure via loginWithMailLink",
"x_generator": {
"engine": "vulncheck"
}
}
},
"cveMetadata": {
"assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
"assignerShortName": "VulnCheck",
"cveId": "CVE-2026-39912",
"datePublished": "2026-04-09T18:35:35.569Z",
"dateReserved": "2026-04-07T20:57:06.209Z",
"dateUpdated": "2026-07-14T20:00:18.922Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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