CVE-2026-55778: 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 bl
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.
Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-55778
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-557780.41% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 33% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-55778 | coverage & exploitation status | NVD · CVE.org |
Recent advisories for Parse Server is
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- highCVE-2026-29519: Lucee CFML Server versions across the 5.3.x, 6.1.x, 6.2.x, and 7.0.x release lines contain a r…nvd · 2026-07-10
- unknownCVE-2026-57481: Parse Server is an open source backend that can be deployed to any infrastructure that can run…nvd · 2026-07-08
- unknownCVE-2026-57480: Parse Server is an open source backend that can be deployed to any infrastructure that can run…nvd · 2026-07-08
- mediumCVE-2026-58470: GNU Wget through 1.25.0, fixed in commit 43d3ba9, contains an integer overflow vulnerability i…nvd · 2026-07-07
- criticalCVE-2026-8924: A flaw in curl’s cookie parsing logic allows a malicious HTTP server to set 'super cookies' tha…nvd · 2026-07-03
- highCVE-2021-47987: Parse Server before 4.10.0 was affected by a supply chain incident in which incorrect version …nvd · 2026-06-25
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