CVE-2026-55778

unknowncovered by 1 sourcefirst seen 2026-07-08

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.

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Exploitation outlook

Low exploitation risk0.41% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 33% of all EPSS-scored CVEs.

Advisory coverage (1)

unknownCVE-2026-55778: Parse Server is an open source backend that can be deployed to any infrastructure that can run…nvd · 2026-07-08

External references

NVD record for CVE-2026-55778

CVE.org record

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