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CVE-2026-35200

Parse Server has a file upload Content-Type override via extension mismatch

Published: Apr 6, 2026Updated: Apr 7, 2026 Sources: CVE List NVDCWE-436
NVD MITRE
5.4CVSSMEDIUM
EPSS Score
0.2%
Top 94.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 8.6.73 and 9.7.1-alpha.4, a file can be uploaded with a filename extension that passes the file extension allowlist (e.g., .txt) but with a Content-Type header that differs from the extension (e.g., text/html). The Content-Type is passed to the storage adapter without consistency validation. Storage adapters that store and serve the provided Content-Type (such as S3 or GCS) serve the file with the mismatched Content-Type. The default GridFS adapter is not affected because it derives Content-Type from the filename at serving time. This vulnerability is fixed in 8.6.73 and 9.7.1-alpha.4.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:RS:CC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-436

Affected Products

parse-serverparseplatform
LibraryLibrary
OSS Libraries / generic-library
parse-serverparse-community
LibraryLibrary
OSS Libraries / npm
parseplatformoss-projectOSS Librariesaka parse platform
parse-communityoss-projectOSS Librariesaka parse, parse server, parse-server

Exploitability

Official Patch Available
Workaround Available

References

https://github.com/parse-community/parse-server/pull/10383
github.com
https://github.com/parse-community/parse-server/pull/10384
github.com
https://github.com/parse-community/parse-server/security/advisories/GHSA-vr5f-2r24-w5hc
github.com

Timeline

Published
Apr 6, 2026
Last Updated
Apr 7, 2026

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