{"id":"GHSA-v8x7-r927-cc93","revision":null,"records":[{"revision":"0339a7f63dfe45d495f739ee0952a57b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-55778","aliases":[],"title":"Parse Server: Stored XSS via non-standard file extension bypassing file upload extension blocklist","description":"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.","state":0,"publishedAt":"2026-07-08T20:50:52.531+00:00","modifiedAt":"2026-07-09T13:39:44.881+00:00","affected":[{"ecosystem":"Vendor product","name":"parse-server","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"parse-community\",\n                    \"product\": \"parse-server\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 9.0.0-alpha.1, < 9.9.1-alpha.11\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"< 8.6.81\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":2.1,"severity":"LOW"}],"references":["https://github.com/parse-community/parse-server/security/advisories/GHSA-v8x7-r927-cc93","https://github.com/parse-community/parse-server/pull/10505","https://github.com/parse-community/parse-server/pull/10506","https://github.com/parse-community/parse-server/commit/97c6a78d19f976ec756c1295f08a8fccab90799a","https://github.com/parse-community/parse-server/commit/be12a60d65b6e140481882037fb896b1f951df50","https://github.com/parse-community/parse-server/releases/tag/8.6.81","https://github.com/parse-community/parse-server/releases/tag/9.9.1-alpha.11"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-55778","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-55778","identifiers":["CVE-2026-55778"]},"retained":false,"historicalAffected":[]},{"revision":"9c9dd5177b094fdbbe360c66addd8dde","observedAt":"2026-11-07T12:34:14.069+00:00","statement":{"source":"euvd","id":"EUVD-2026-42414","aliases":["CVE-2026-55778","GHSA-v8x7-r927-cc93"],"title":"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-sta…","description":"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.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","vector":"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","score":2.1,"severity":null}],"references":["https://github.com/parse-community/parse-server/security/advisories/GHSA-v8x7-r927-cc93","https://github.com/parse-community/parse-server/pull/10505","https://github.com/parse-community/parse-server/pull/10506","https://github.com/parse-community/parse-server/commit/97c6a78d19f976ec756c1295f08a8fccab90799a","https://github.com/parse-community/parse-server/commit/be12a60d65b6e140481882037fb896b1f951df50","https://github.com/parse-community/parse-server/releases/tag/8.6.81","https://github.com/parse-community/parse-server/releases/tag/9.9.1-alpha.11"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-42414","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Jul 8, 2026, 8:50:52 PM","dateUpdated":"Jul 9, 2026, 1:39:44 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-42414","identifiers":["EUVD-2026-42414","CVE-2026-55778","GHSA-v8x7-r927-cc93"]},"retained":false,"historicalAffected":[]},{"revision":"d6625e2ce5534e54a151f9a52af2863e","observedAt":"2026-10-27T15:15:14.036+00:00","statement":{"source":"nvd","id":"CVE-2026-55778","aliases":[],"title":"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-sta…","description":"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.","state":0,"publishedAt":"2026-07-08T21:16:50.387+00:00","modifiedAt":"2026-10-25T17:10:00.197+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","vector":"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/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","score":2.1,"severity":"LOW"}],"references":["https://github.com/parse-community/parse-server/commit/97c6a78d19f976ec756c1295f08a8fccab90799a","https://github.com/parse-community/parse-server/commit/be12a60d65b6e140481882037fb896b1f951df50","https://github.com/parse-community/parse-server/pull/10505","https://github.com/parse-community/parse-server/pull/10506","https://github.com/parse-community/parse-server/releases/tag/8.6.81","https://github.com/parse-community/parse-server/releases/tag/9.9.1-alpha.11","https://github.com/parse-community/parse-server/security/advisories/GHSA-v8x7-r927-cc93"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55778","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-434"],"productCriteria":[],"sourceDates":{"published":"2026-07-08T21:16:50.387","lastModified":"2026-10-25T17:10:00.197"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-55778","identifiers":["CVE-2026-55778"]},"retained":false,"historicalAffected":[]},{"revision":"4efe17f4b8894787a9bba497245ea0eb","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-v8x7-r927-cc93","aliases":["BIT-parse-2026-55778","CVE-2026-55778"],"title":"parse-server: Stored XSS via non-standard file extension bypassing file upload extension blocklist","description":"### Impact\n\nParse Server's default `fileUpload.fileExtensions` blocklist is intended to prevent uploading files that browsers render as active content (such as HTML and SVG), which can be used to perform stored cross-site scripting (XSS) attacks against other users. The blocklist could be bypassed by uploading a file whose extension is not an exact match of a blocked extension (for example a non-standard or compound extension) together with a dangerous content type. On storage adapters that persist and serve the uploaded content type (such as S3 and GCS), the file is then served with the attacker-supplied content type, enabling stored XSS against users who open the file URL.\n\nThis affects the default configuration, in which authenticated users are allowed to upload files. The default GridFS/filesystem adapter sets the `X-Content-Type-Options: nosniff` response header, which mitigates browser rendering on that adapter, but the upload restriction itself is still bypassed. This is an incomplete-fix follow-up of GHSA-vr5f-2r24-w5hc and GHSA-7wqv-xjf3-x35v.\n\n### Patches\n\nThe file upload extension validation now also evaluates the request content type against the configured blocklist whenever the filename's extension is not a recognized type. As a result, a dangerous content type can no longer be preserved by uploading a file with a non-standard extension, and such uploads are rejected.\n\n### Workarounds\n\nConfigure `fileUpload.fileExtensions` as a strict allowlist of only the file extensions your application needs (for example `[\"^(png|jpe?g|gif|pdf)$\"]`) instead of relying on the default blocklist. Additionally, serve uploaded files from a separate domain than the application, so that any executed content is isolated from the application's origin.","state":0,"publishedAt":"2026-06-19T19:36:36+00:00","modifiedAt":"2026-07-14T16:40:35.6299926+00:00","affected":[{"ecosystem":"npm","name":"parse-server","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"9.0.0"},{"kind":"fixed","version":"9.9.1-alpha.11"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"parse-server","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"8.6.81"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"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","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"LOW"}],"references":["https://github.com/parse-community/parse-server/security/advisories/GHSA-v8x7-r927-cc93","https://github.com/parse-community/parse-server/pull/10505","https://github.com/parse-community/parse-server/pull/10506","https://github.com/parse-community/parse-server"],"sourceUrl":"https://github.com/advisories/GHSA-v8x7-r927-cc93","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-v8x7-r927-cc93","identifiers":["GHSA-v8x7-r927-cc93","BIT-parse-2026-55778","CVE-2026-55778"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-07T21:52:16.7895348+00:00","complete":true,"records":1769,"lastAttemptAt":"2026-11-07T21:52:16.7895348+00:00","lastSuccessAt":"2026-11-07T21:52:17.018923+00:00","error":null,"lastVerifiedAt":"2026-11-07T21:52:17.0189237+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-bb5c9d5a08063ef076042e33dd72a7d0ffa4c4487efdcf3106e29ba55ec2ad57-5978693a555a2fac0feee4f8e1cdc5e013b9a91b16046d4e34ae63a3d3db8d19","complete":true,"records":420947,"lastAttemptAt":"2026-11-07T21:52:16.4606105+00:00","lastSuccessAt":"2026-11-07T21:52:16.3995215+00:00","error":null,"lastVerifiedAt":"2026-11-07T21:52:16.4606105+00:00","snapshotPublishedAt":"2026-11-07T21:18:20+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-c91a0736a9624a48aebf081ca5dd86b2","complete":true,"records":13633,"lastAttemptAt":"2026-11-07T22:04:27.1191985+00:00","lastSuccessAt":"2026-11-07T22:04:27.115+00:00","error":null,"lastVerifiedAt":"2026-11-07T22:04:27.115+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13685,"expectedIdentifiers":13685,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-07T21:52:16.7895348+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-07T21:52:16.7895348+00:00","lastSuccessAt":"2026-11-07T21:52:17.0199092+00:00","error":null,"lastVerifiedAt":"2026-11-07T21:52:17.0199095+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-2b22c2d15f834007aa54c93f73b8deaf","complete":true,"records":13645,"lastAttemptAt":"2026-11-07T21:52:42.2590883+00:00","lastSuccessAt":"2026-11-07T21:52:42.255+00:00","error":null,"lastVerifiedAt":"2026-11-07T21:52:42.255+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13685,"expectedIdentifiers":13685,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-0eb4d6dde62dffacd040ad992d4fd5a65cd7d0dc5f5f4cfa8b41967fc6f9ca5f","complete":true,"records":9914,"lastAttemptAt":"2026-11-07T21:52:16.7352005+00:00","lastSuccessAt":"2026-11-06T20:10:36.6450506+00:00","error":null,"lastVerifiedAt":"2026-11-07T21:52:16.7352005+00:00","snapshotPublishedAt":"2026-11-06T20:02:57+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-fde804134ecdda0ddd5ff5c26ee1fff5a6fa659311f7ef2e51c6ad54964db0e2","complete":true,"records":1971,"lastAttemptAt":"2026-11-07T21:52:16.5087916+00:00","lastSuccessAt":"2026-11-06T19:03:17.0399903+00:00","error":null,"lastVerifiedAt":"2026-11-07T21:52:16.5087916+00:00","snapshotPublishedAt":"2026-11-06T18:17:57+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-335633e78a15c9cde10a6025895b5617717087fb945489ae7e15d377bacf34a9","complete":true,"records":3055,"lastAttemptAt":"2026-11-07T21:52:16.7531721+00:00","lastSuccessAt":"2026-11-06T16:03:00.7615789+00:00","error":null,"lastVerifiedAt":"2026-11-07T21:52:16.7531721+00:00","snapshotPublishedAt":"2026-11-06T16:02:48+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-40ad6183a951565ace1520a9b4d631e1d0bfb1d4bf7c5574c375032559f3ff53","complete":true,"records":231292,"lastAttemptAt":"2026-11-07T21:52:16.6283313+00:00","lastSuccessAt":"2026-11-07T10:29:00.4821259+00:00","error":null,"lastVerifiedAt":"2026-11-07T21:52:16.6283313+00:00","snapshotPublishedAt":"2026-11-07T09:32:47+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}