{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-55778", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-17T14:40:28.379Z", "datePublished": "2026-07-08T20:50:52.531Z", "dateUpdated": "2026-07-08T20:50:52.531Z"}, "containers": {"cna": {"title": "Parse Server: Stored XSS via non-standard file extension bypassing file upload extension blocklist", "problemTypes": [{"descriptions": [{"cweId": "CWE-434", "lang": "en", "description": "CWE-434: Unrestricted Upload of File with Dangerous Type", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "LOW", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "LOW", "subAvailabilityImpact": "NONE", "baseScore": 2.1, "baseSeverity": "LOW", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N", "version": "4.0"}}], "references": [{"name": "https://github.com/parse-community/parse-server/security/advisories/GHSA-v8x7-r927-cc93", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/parse-community/parse-server/security/advisories/GHSA-v8x7-r927-cc93"}, {"name": "https://github.com/parse-community/parse-server/pull/10505", "tags": ["x_refsource_MISC"], "url": "https://github.com/parse-community/parse-server/pull/10505"}, {"name": "https://github.com/parse-community/parse-server/pull/10506", "tags": ["x_refsource_MISC"], "url": "https://github.com/parse-community/parse-server/pull/10506"}, {"name": "https://github.com/parse-community/parse-server/commit/97c6a78d19f976ec756c1295f08a8fccab90799a", "tags": ["x_refsource_MISC"], "url": "https://github.com/parse-community/parse-server/commit/97c6a78d19f976ec756c1295f08a8fccab90799a"}, {"name": "https://github.com/parse-community/parse-server/commit/be12a60d65b6e140481882037fb896b1f951df50", "tags": ["x_refsource_MISC"], "url": "https://github.com/parse-community/parse-server/commit/be12a60d65b6e140481882037fb896b1f951df50"}, {"name": "https://github.com/parse-community/parse-server/releases/tag/8.6.81", "tags": ["x_refsource_MISC"], "url": "https://github.com/parse-community/parse-server/releases/tag/8.6.81"}, {"name": "https://github.com/parse-community/parse-server/releases/tag/9.9.1-alpha.11", "tags": ["x_refsource_MISC"], "url": "https://github.com/parse-community/parse-server/releases/tag/9.9.1-alpha.11"}], "affected": [{"vendor": "parse-community", "product": "parse-server", "versions": [{"version": ">= 9.0.0-alpha.1, < 9.9.1-alpha.11", "status": "affected"}, {"version": "< 8.6.81", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-07-08T20:50:52.531Z"}, "descriptions": [{"lang": "en", "value": "Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.9.1-alpha.11 and 8.6.81, the default fileUpload.fileExtensions blocklist could be bypassed by uploading a file with a non-standard or compound extension and dangerous content type, allowing storage adapters such as S3 and GCS to serve attacker-supplied active content and enable stored cross-site scripting. This issue is fixed in versions 9.9.1-alpha.11 and 8.6.81."}], "source": {"advisory": "GHSA-v8x7-r927-cc93", "discovery": "UNKNOWN"}}}}

{}

{}

{}

{}