CVE-2026-49952

{"id": "CVE-2026-49952", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-49952", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-06-15T19:58:52.987295Z"}}], "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": 9.3, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/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": "NONE", "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://gitee.com/Discuz/DiscuzX", "vendor": "Discuz!", "product": "Discuz! X5.0", "versions": [{"status": "affected", "version": "20260320", "versionType": "date", "lessThanOrEqual": "20260501"}], "defaultStatus": "affected"}]}], "published": "2026-06-15T20:16:29.103", "references": [{"url": "https://gitee.com/Discuz/DiscuzX/commit/9962dad52c4c6999dabaf91ecd70377c680ff3c6", "source": "disclosure@vulncheck.com"}, {"url": "https://karmainsecurity.com/KIS-2026-09", "source": "disclosure@vulncheck.com"}, {"url": "https://karmainsecurity.com/chaining-bugs-in-discuz-from-race-condition-to-rce", "source": "disclosure@vulncheck.com"}, {"url": "https://www.vulncheck.com/advisories/discuz-x5-0-authentication-bypass-via-dbbak-php-encryption-oracle", "source": "disclosure@vulncheck.com"}, {"url": "http://seclists.org/fulldisclosure/2026/Jun/3", "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "description": [{"lang": "en", "value": "CWE-323"}]}], "descriptions": [{"lang": "en", "value": "Discuz! X5.0 releases 20260320 through 20260501 contains an authentication bypass vulnerability that allows unauthenticated remote attackers to gain unauthorized access to database backup and restore functionality by exploiting a shared cryptographic key between UCenter integration and the database backup API exposed by dbbak.php. Attackers can inject a crafted payload through the username parameter during login to abuse the encryption oracle in logging_ctl::logging_more(), obtain a legitimately signed token, and use it to bypass authorization for database export and import operations, with the additional ability to trigger a race condition to impersonate arbitrary users."}, {"lang": "es", "value": "Las versiones 20260320 a 20260501 de Discuz! X5.0 contienen una vulnerabilidad de omisi\u00f3n de autenticaci\u00f3n que permite a atacantes remotos no autenticados obtener acceso no autorizado a la funcionalidad de copia de seguridad y restauraci\u00f3n de la base de datos explotando una clave criptogr\u00e1fica compartida entre la integraci\u00f3n de UCenter y la API de copia de seguridad de la base de datos expuesta por dbbak.php. Los atacantes pueden inyectar una carga \u00fatil manipulada a trav\u00e9s del par\u00e1metro de nombre de usuario durante el inicio de sesi\u00f3n para abusar del or\u00e1culo de cifrado en logging_ctl::logging_more(), obtener un token firmado leg\u00edtimamente y usarlo para omitir la autorizaci\u00f3n para operaciones de exportaci\u00f3n e importaci\u00f3n de la base de datos, con la capacidad adicional de desencadenar una condici\u00f3n de carrera para suplantar a usuarios arbitrarios."}], "lastModified": "2026-10-25T23:10:00.167", "sourceIdentifier": "disclosure@vulncheck.com"}