CVE-2026-49757

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Per OpenID Connect Core \u00a75.7, only <tt>iss</tt>/<tt>sub</tt> uniquely and stably identifies an end-user; other claims, including <tt>email</tt>, MUST NOT be used as unique identifiers.</p><p>A provider login presenting a victim's email, including an unverified email, a reused email, or an account with <tt>email_verified: false</tt>, resolved to and signed in as the victim's existing local account. An unauthenticated attacker who can register an account on any accepted OAuth provider with the victim's email (or who benefits from provider-side email reuse or reclamation) obtains the victim's full local privileges.</p><p>The fix resolves users by the <tt>(strategy, sub)</tt> identity stored in a user identity resource, and only links a new <tt>sub</tt> to an existing local account by email when the provider's <tt>email_verified</tt> claim is trusted (<tt>trust_email_verified?</tt>).</p><p>This issue affects ash_authentication from 0.1.0 before 4.14.0 and from 5.0.0-rc.0 before 5.0.0-rc.10.</p>"}], "value": "Authentication Bypass by Spoofing vulnerability in team-alembic AshAuthentication allows account takeover of local users via OAuth2/OIDC sign-in.\n\nAshAuthentication's OAuth2 and OIDC family strategies matched the local user by email address (an upsert on the email field, or a user-defined sign-in filter) rather than by the OpenID Connect iss/sub claim combination. Per OpenID Connect Core \u00a75.7, only iss/sub uniquely and stably identifies an end-user; other claims, including email, MUST NOT be used as unique identifiers.\n\nA provider login presenting a victim's email, including an unverified email, a reused email, or an account with email_verified: false, resolved to and signed in as the victim's existing local account. An unauthenticated attacker who can register an account on any accepted OAuth provider with the victim's email (or who benefits from provider-side email reuse or reclamation) obtains the victim's full local privileges.\n\nThe fix resolves users by the (strategy, sub) identity stored in a user identity resource, and only links a new sub to an existing local account by email when the provider's email_verified claim is trusted (trust_email_verified?).\n\nThis issue affects ash_authentication from 0.1.0 before 4.14.0 and from 5.0.0-rc.0 before 5.0.0-rc.10."}], "impacts": [{"capecId": "CAPEC-21", "descriptions": [{"lang": "en", "value": "CAPEC-21 Exploitation of Trusted Identifiers"}]}], "metrics": [{"cvssV4_0": {"attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "baseScore": 9.2, "baseSeverity": "CRITICAL", "privilegesRequired": "NONE", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-290", "description": "CWE-290 Authentication Bypass by Spoofing", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-06-15T14:14:37.882Z"}, "references": [{"tags": ["vendor-advisory", "related"], "url": "https://github.com/team-alembic/ash_authentication/security/advisories/GHSA-777c-2fxx-qr28"}, {"tags": ["related"], "url": "https://cna.erlef.org/cves/CVE-2026-49757.html"}, {"tags": ["related"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-49757"}, {"tags": ["patch"], "url": "https://github.com/team-alembic/ash_authentication/commit/728b8d28c1b5f465fa1116ef044a815300fc733d"}, {"tags": ["patch"], "url": "https://github.com/team-alembic/ash_authentication/commit/64530644f9b37ebb76ca14aeb83a77597a0034b7"}], "source": {"discovery": "EXTERNAL"}, "title": "OAuth2/OIDC account takeover in AshAuthentication via email-based user matching", "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-06-15T12:35:13.009558Z", "id": "CVE-2026-49757", "options": [{"Exploitation": "poc"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-15T12:35:41.459Z"}}]}}

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Per OpenID Connect Core \u00a75.7, only iss/sub uniquely and stably identifies an end-user; other claims, including email, MUST NOT be used as unique identifiers.\n\nA provider login presenting a victim's email, including an unverified email, a reused email, or an account with email_verified: false, resolved to and signed in as the victim's existing local account. An unauthenticated attacker who can register an account on any accepted OAuth provider with the victim's email (or who benefits from provider-side email reuse or reclamation) obtains the victim's full local privileges.\n\nThe fix resolves users by the (strategy, sub) identity stored in a user identity resource, and only links a new sub to an existing local account by email when the provider's email_verified claim is trusted (trust_email_verified?).\n\nThis issue affects ash_authentication from 0.1.0 before 4.14.0 and from 5.0.0-rc.0 before 5.0.0-rc.10.", "supportingMedia": [{"type": "text/html", "value": "Authentication Bypass by Spoofing vulnerability in team-alembic AshAuthentication allows account takeover of local users via OAuth2/OIDC sign-in.<p>AshAuthentication's OAuth2 and OIDC family strategies matched the local user by email address (an upsert on the email field, or a user-defined sign-in filter) rather than by the OpenID Connect <tt>iss</tt>/<tt>sub</tt> claim combination. Per OpenID Connect Core \u00a75.7, only <tt>iss</tt>/<tt>sub</tt> uniquely and stably identifies an end-user; other claims, including <tt>email</tt>, MUST NOT be used as unique identifiers.</p><p>A provider login presenting a victim's email, including an unverified email, a reused email, or an account with <tt>email_verified: false</tt>, resolved to and signed in as the victim's existing local account. An unauthenticated attacker who can register an account on any accepted OAuth provider with the victim's email (or who benefits from provider-side email reuse or reclamation) obtains the victim's full local privileges.</p><p>The fix resolves users by the <tt>(strategy, sub)</tt> identity stored in a user identity resource, and only links a new <tt>sub</tt> to an existing local account by email when the provider's <tt>email_verified</tt> claim is trusted (<tt>trust_email_verified?</tt>).</p><p>This issue affects ash_authentication from 0.1.0 before 4.14.0 and from 5.0.0-rc.0 before 5.0.0-rc.10.</p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-290", "description": "CWE-290 Authentication Bypass by Spoofing"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:team-alembic:ash_authentication:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "4.14.0", "versionStartIncluding": "0.1.0"}, {"criteria": "cpe:2.3:a:team-alembic:ash_authentication:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.0.0-rc.10", "versionStartIncluding": "5.0.0-rc.0"}], "operator": "OR"}], "operator": "AND"}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-06-15T14:14:37.882Z"}}}, "cveMetadata": {"cveId": "CVE-2026-49757", "state": "PUBLISHED", "dateUpdated": "2026-06-15T14:14:37.882Z", "dateReserved": "2026-06-01T13:45:22.449Z", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "datePublished": "2026-06-15T10:07:17.781Z", "assignerShortName": "EEF"}, "dataVersion": "5.2"}

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Per OpenID Connect Core \u00a75.7, only iss/sub uniquely and stably identifies an end-user; other claims, including email, MUST NOT be used as unique identifiers.\n\nA provider login presenting a victim's email, including an unverified email, a reused email, or an account with email_verified: false, resolved to and signed in as the victim's existing local account. An unauthenticated attacker who can register an account on any accepted OAuth provider with the victim's email (or who benefits from provider-side email reuse or reclamation) obtains the victim's full local privileges.\n\nThe fix resolves users by the (strategy, sub) identity stored in a user identity resource, and only links a new sub to an existing local account by email when the provider's email_verified claim is trusted (trust_email_verified?).\n\nThis issue affects ash_authentication from 0.1.0 before 4.14.0 and from 5.0.0-rc.0 before 5.0.0-rc.10."}, {"lang": "es", "value": "Una vulnerabilidad de omisi\u00f3n de autenticaci\u00f3n por suplantaci\u00f3n en team-alembic AshAuthentication permite la toma de control de cuentas de usuarios locales a trav\u00e9s del inicio de sesi\u00f3n OAuth2/OIDC.\n\nLas estrategias de la familia OAuth2 y OIDC de AshAuthentication coincid\u00edan con el usuario local por direcci\u00f3n de correo electr\u00f3nico (una operaci\u00f3n de \u2019upsert\u2019 en el campo de correo electr\u00f3nico, o un filtro de inicio de sesi\u00f3n definido por el usuario) en lugar de por la combinaci\u00f3n de reclamaciones iss/sub de OpenID Connect. Seg\u00fan OpenID Connect Core \u00a75.7, solo iss/sub identifica de forma \u00fanica y estable a un usuario final; otras reclamaciones, incluido el correo electr\u00f3nico, NO DEBEN usarse como identificadores \u00fanicos.\n\nUn inicio de sesi\u00f3n de proveedor que presentaba el correo electr\u00f3nico de una v\u00edctima, incluido un correo electr\u00f3nico no verificado, un correo electr\u00f3nico reutilizado o una cuenta con email_verified: false, se resolvi\u00f3 y se inici\u00f3 sesi\u00f3n como la cuenta local existente de la v\u00edctima. Un atacante no autenticado que puede registrar una cuenta en cualquier proveedor OAuth aceptado con el correo electr\u00f3nico de la v\u00edctima (o que se beneficia de la reutilizaci\u00f3n o recuperaci\u00f3n de correo electr\u00f3nico por parte del proveedor) obtiene los privilegios locales completos de la v\u00edctima.\n\nLa soluci\u00f3n resuelve a los usuarios por la identidad (estrategia, sub) almacenada en un recurso de identidad de usuario, y solo vincula un nuevo sub a una cuenta local existente por correo electr\u00f3nico cuando la reclamaci\u00f3n email_verified del proveedor es de confianza (\u00bftrust_email_verified?).\n\nEste problema afecta a ash_authentication desde 0.1.0 antes de 4.14.0 y desde 5.0.0-rc.0 antes de 5.0.0-rc.10."}], "id": "CVE-2026-49757", "lastModified": "2026-10-25T23:10:00.167", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 9.2, "baseSeverity": "CRITICAL", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/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", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-49757", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-06-15T12:35:13.009558Z", "version": "2.0.3"}}]}, "published": "2026-06-15T12:16:25.777", "references": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://cna.erlef.org/cves/CVE-2026-49757.html"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/team-alembic/ash_authentication/commit/64530644f9b37ebb76ca14aeb83a77597a0034b7"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/team-alembic/ash_authentication/commit/728b8d28c1b5f465fa1116ef044a815300fc733d"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/team-alembic/ash_authentication/security/advisories/GHSA-777c-2fxx-qr28"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://osv.dev/vulnerability/EEF-CVE-2026-49757"}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-290"}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.1.0,4.14.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.0.0-rc.0,5.0.0-rc.10)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c5f589058e04239263f50a1430eb17ea6d5dd1a2,*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "code_commit", "value": "728b8d28c1b5f465fa1116ef044a815300fc733d"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "code_commit", "value": "64530644f9b37ebb76ca14aeb83a77597a0034b7"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "ash_authentication", "source": "cna", "vendor": "team-alembic"}, "product": "ash_authentication", "vendor": "team-alembic"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c5f589058e04239263f50a1430eb17ea6d5dd1a2,*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "code_commit", "value": "728b8d28c1b5f465fa1116ef044a815300fc733d"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "code_commit", "value": "64530644f9b37ebb76ca14aeb83a77597a0034b7"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "ash_authentication", "source": "cna", "vendor": "team-alembic"}, "product": "ash_authentication", "vendor": "team-alembic"}], "created": "2026-06-15T13:30:05.227160+00:00", "updated": "2026-06-15T15:15:17.531921+00:00", "vendors": ["team-alembic", "team-alembic$PRODUCT$ash_authentication"]}