Vulnerability 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.
Related Weaknesses (CWE)
References
- https://github.com/parse-community/parse-server/commit/97c6a78d19f976ec756c1295f
- https://github.com/parse-community/parse-server/commit/be12a60d65b6e140481882037
- 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-r9
FAQ
What is CVE-2026-55778?
CVE-2026-55778 is a documented vulnerability. 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 byp...
How severe is CVE-2026-55778?
CVSS scoring is not yet available for CVE-2026-55778. Check NVD for updates.
Is there a patch for CVE-2026-55778?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.