CVE-2026-39912

{"id": "CVE-2026-39912", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-39912", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-04-10T20:16:59.517212Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.1, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 3.9}], "cvssMetricV40": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 9.1, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "valueDensity": "NOT_DEFINED", "vectorString": "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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "disclosure@vulncheck.com", "affectedData": [{"repo": "https://github.com/v2board/v2board", "vendor": "v2board", "product": "v2board", "versions": [{"status": "affected", "version": "1.6.1", "versionType": "semver", "lessThanOrEqual": "1.7.4"}, {"status": "affected", "version": "bdb10bed32c5f37df2f0872c3cb354e9b7a293bd", "versionType": "git", "lessThanOrEqual": "0ca47622a50116d0ddd7ffb316b157afb57d25e8"}], "packageURL": "pkg:github/v2board/v2board", "defaultStatus": "unknown"}, {"repo": "https://github.com/cedar2025/Xboard", "vendor": "cedar2025", "product": "Xboard", "versions": [{"status": "affected", "version": "0", "versionType": "semver", "lessThanOrEqual": "0.1.9"}, {"status": "unaffected", "version": "121511523f04882ec0c7447acd9b8ebcb8a47957", "versionType": "git"}], "packageURL": "pkg:github/cedar2025/Xboard", "defaultStatus": "unaffected"}]}], "published": "2026-04-09T19:16:25.920", "references": [{"url": "https://chocapikk.com/posts/2026/xboard-v2board-account-takeover/", "source": "disclosure@vulncheck.com"}, {"url": "https://github.com/cedar2025/Xboard/blob/1fe6531924cc1ec662a88b9ef725afcf78d660bc/app/Http/Controllers/V1/Passport/AuthController.php#L51", "source": "disclosure@vulncheck.com"}, {"url": "https://github.com/cedar2025/Xboard/blob/1fe6531924cc1ec662a88b9ef725afcf78d660bc/app/Services/Auth/MailLinkService.php#L49", "source": "disclosure@vulncheck.com"}, {"url": "https://github.com/cedar2025/Xboard/commit/121511523f04882ec0c7447acd9b8ebcb8a47957", "source": "disclosure@vulncheck.com"}, {"url": "https://github.com/cedar2025/Xboard/pull/873", "source": "disclosure@vulncheck.com"}, {"url": "https://github.com/v2board/v2board/blob/0ca47622a50116d0ddd7ffb316b157afb57d25e8/app/Http/Controllers/Passport/AuthController.php#L71", "source": "disclosure@vulncheck.com"}, {"url": "https://github.com/v2board/v2board/pull/981", "source": "disclosure@vulncheck.com"}, {"url": "https://www.vulncheck.com/advisories/v2board-xboard-authentication-token-exposure-via-loginwithmaillink", "source": "disclosure@vulncheck.com"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "description": [{"lang": "en", "value": "CWE-201"}]}], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "V2Board 1.6.1 hasta 1.7.4 y Xboard hasta 0.1.9 exponen tokens de autenticaci\u00f3n en los cuerpos de respuesta HTTP del endpoint loginWithMailLink cuando la caracter\u00edstica login_with_mail_link_enable est\u00e1 activa. Atacantes no autenticados pueden realizar una solicitud POST al endpoint loginWithMailLink con una direcci\u00f3n de correo electr\u00f3nico conocida para recibir la URL de autenticaci\u00f3n completa en la respuesta, luego intercambiar el token en el endpoint token2Login para obtener un token de portador v\u00e1lido con acceso completo a la cuenta, incluyendo privilegios de administrador."}], "lastModified": "2026-10-26T21:10:00.170", "sourceIdentifier": "disclosure@vulncheck.com"}