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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.

PUBLISHED Reserved 2026-06-17 | Published 2026-07-08 | Updated 2026-07-09 | Assigner GitHub_M




LOW: 2.1CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N

Problem types

CWE-434: Unrestricted Upload of File with Dangerous Type

Product status

>= 9.0.0-alpha.1, < 9.9.1-alpha.11
affected

< 8.6.81
affected

References

github.com/...server/security/advisories/GHSA-v8x7-r927-cc93

github.com/parse-community/parse-server/pull/10505

github.com/parse-community/parse-server/pull/10506

github.com/...ommit/97c6a78d19f976ec756c1295f08a8fccab90799a

github.com/...ommit/be12a60d65b6e140481882037fb896b1f951df50

github.com/parse-community/parse-server/releases/tag/8.6.81

github.com/...unity/parse-server/releases/tag/9.9.1-alpha.11

cve.org (CVE-2026-55778)

nvd.nist.gov (CVE-2026-55778)

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