CVE-2026-31901

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Prior to 8.6.34 and 9.6.0-alpha.8, the email verification endpoint (/verificationEmailRequest) returns distinct error responses depending on whether an email address belongs to an existing user, is already verified, or does not exist. An attacker can send requests with different email addresses and observe the error codes to determine which email addresses are registered in the application. This is a user enumeration vulnerability that affects any Parse Server deployment with email verification enabled (verifyUserEmails: true). This vulnerability is fixed in 8.6.34 and 9.6.0-alpha.8."}, {"lang": "es", "value": "Parse Server es un backend de c\u00f3digo abierto que puede ser desplegado en cualquier infraestructura que pueda ejecutar Node.js. Antes de las versiones 8.6.34 y 9.6.0-alpha.8, el endpoint de verificaci\u00f3n de correo electr\u00f3nico (/verificationEmailRequest) devuelve respuestas de error distintas dependiendo de si una direcci\u00f3n de correo electr\u00f3nico pertenece a un usuario existente, ya est\u00e1 verificada o no existe. Un atacante puede enviar solicitudes con diferentes direcciones de correo electr\u00f3nico y observar los c\u00f3digos de error para determinar qu\u00e9 direcciones de correo electr\u00f3nico est\u00e1n registradas en la aplicaci\u00f3n. Esta es una vulnerabilidad de enumeraci\u00f3n de usuarios que afecta a cualquier despliegue de Parse Server con la verificaci\u00f3n de correo electr\u00f3nico habilitada (verifyUserEmails: true). Esta vulnerabilidad est\u00e1 corregida en las versiones 8.6.34 y 9.6.0-alpha.8."}], "id": "CVE-2026-31901", "lastModified": "2026-06-17T10:34:43.603", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.3, "baseSeverity": "MEDIUM", "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:L/VI:N/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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-31901", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-12T20:01:34.497566Z", "version": "2.0.3"}}]}, "published": "2026-03-11T20:16:16.120", "references": [{"source": "security-advisories@github.com", "tags": ["Product", "Release Notes"], "url": "https://github.com/parse-community/parse-server/releases/tag/8.6.34"}, {"source": "security-advisories@github.com", "tags": ["Product", "Release Notes"], "url": "https://github.com/parse-community/parse-server/releases/tag/9.6.0-alpha.8"}, {"source": "security-advisories@github.com", "tags": ["Patch", "Vendor Advisory"], "url": "https://github.com/parse-community/parse-server/security/advisories/GHSA-w54v-hf9p-8856"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-204"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.0.0,9.6.0-alpha.8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,8.6.34)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "parse-server", "source": "cna", "vendor": "parse-community"}, "product": "parse_server", "vendor": "parse_community"}], "analysis": {"en": {"generated_at": "2026-03-17T16:29:18.174121+00:00", "value": {"mitigation_remediation": ["Upgrade Parse Server to version 8.6.34 or newer", "Upgrade Parse Server to version 9.6.0-alpha.8 or newer"], "summary": {"action": "Patch", "impact": "Information Disclosure"}, "threat_synthesis": {"affected_systems": "Deployments of Parse Server using any version prior to 8.6.34 or 9.6.0\u2011alpha.8 with email verification enabled (verifyUserEmails: true) are affected. The vulnerability is present in all releases listed before the fix, as noted in the vendor\u2019s release announcements.", "description_and_impact": "The vulnerability exists in Parse Server\u2019s /verificationEmailRequest endpoint. Key detail from the official description: the endpoint returns distinct error codes depending on whether an email address belongs to a registered user, is already verified, or does not exist. This inconsistency enables an attacker to determine which email addresses are registered in the application (user\u2011enumeration), classified as CWE\u2011204. The impact is a disclosure of valid user accounts, which can be leveraged for phishing or credential\u2011reuse attacks; it does not allow code execution or direct access to other data, but it compromises user confidentiality.", "risk_and_exploitability": "Based on the description, the likely attack vector is remote HTTP requests to the publicly exposed /verificationEmailRequest endpoint; no authentication is required. The CVSS score of 6.3 indicates medium severity, and the EPSS score of less than 1% suggests a low probability of active exploitation. The vulnerability is not listed in CISA\u2019s KEV catalog. Exploitation requires only the ability to send standard HTTP requests and observe response codes, making it accessible to attackers with minimal effort, though the low EPSS mitigates immediate concern."}}}}, "created": "2026-03-12T09:56:45.701060+00:00", "updated": "2026-03-20T15:29:20.344091+00:00", "vendors": ["parse_community", "parse_community$PRODUCT$parse_server"]}