CVE-2026-31813

{"id": "CVE-2026-31813", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.8, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 2.5, "exploitabilityScore": 2.2}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.8, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 2.5, "exploitabilityScore": 2.2}]}, "published": "2026-03-11T17:16:58.107", "references": [{"url": "https://github.com/supabase/auth/security/advisories/GHSA-v36f-qvww-8w8m", "tags": ["Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-290"}]}], "descriptions": [{"lang": "en", "value": "Supabase Auth is a JWT based API for managing users and issuing JWT tokens. Prior to 2.185.0, a vulnerability has been identified that allows an attacker to issue sessions for arbitrary users using specially crafted ID tokens when the Apple or Azure providers are enabled. The attacker issues a valid, asymmetrically signed ID token from their issuer for each victim email address, which then is sent to the Supabase Auth token endpoint using the ID token flow. If the ID token is OIDC compliant, the Auth server would validate it against the attacker-controlled issuer and link the existing OIDC identity (Apple or Azure) of the victim to an additional OIDC identity based on the ID token contents. The Auth server would then issue a valid user session (access and refresh tokens) at the AAL1 level to the attacker. This vulnerability is fixed in 2.185.0."}, {"lang": "es", "value": "Supabase Auth es una API basada en JWT para gestionar usuarios y emitir tokens JWT. Antes de la versi\u00f3n 2.185.0, se ha identificado una vulnerabilidad que permite a un atacante emitir sesiones para usuarios arbitrarios utilizando tokens de ID especialmente dise\u00f1ados cuando los proveedores de Apple o Azure est\u00e1n habilitados. El atacante emite un token de ID v\u00e1lido, firmado asim\u00e9tricamente, desde su emisor para cada direcci\u00f3n de correo electr\u00f3nico de la v\u00edctima, el cual luego se env\u00eda al endpoint de tokens de Supabase Auth utilizando el flujo de tokens de ID. Si el token de ID cumple con OIDC, el servidor de Auth lo validar\u00eda contra el emisor controlado por el atacante y vincular\u00eda la identidad OIDC existente (Apple o Azure) de la v\u00edctima a una identidad OIDC adicional basada en el contenido del token de ID. El servidor de Auth emitir\u00eda entonces una sesi\u00f3n de usuario v\u00e1lida (tokens de acceso y de actualizaci\u00f3n) en el nivel AAL1 al atacante. Esta vulnerabilidad est\u00e1 corregida en la versi\u00f3n 2.185.0."}], "lastModified": "2026-03-20T14:06:42.643", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:supabase:auth:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "3B8F521E-D938-41A7-9CD8-453D430D33CD", "versionEndExcluding": "2.185.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}