CVE-2026-32878
published 2026-03-18CVE-2026-32878: Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.6.0-alpha.20 and 8.6.44, an attacker can…
PriorityP347high7.5CVSS 3.1
AVNACLPRNUINSUCNIHAN
EPSS
0.34%
26.3th percentile
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.6.0-alpha.20 and 8.6.44, an attacker can bypass the default request keyword denylist protection and the class-level permission for adding fields by sending a crafted request that exploits prototype pollution in the deep copy mechanism. This allows injecting fields into class schemas that have field addition locked down, and can cause permanent schema type conflicts that cannot be resolved even with the master key. In 9.6.0-alpha.20 and 8.6.44, the vulnerable third-party deep copy library has been replaced with a built-in deep clone mechanism that handles prototype properties safely, allowing the existing denylist check to correctly detect and reject the prohibited keyword. No known workarounds are available.
Affected
7 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| parse-community | parse-server | < 8.6.44 | 8.6.44 |
| parse-community | parse-server | — | — |
| parse-community | parse-server | >= 0 < 8.6.44 | 8.6.44 |
| parse-community | parse-server | >= 9.0.0 < 9.6.0-alpha.20 | 9.6.0-alpha.20 |
| parseplatform | parse-server | < 8.6.44 | 8.6.44 |
| parseplatform | parse-server | — | — |
| parseplatform | parse-server | >= 9.0.0 < 9.6.0 | 9.6.0 |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
nvdv4.05.3MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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OSV
Parse Server vulnerable to schema poisoning via prototype pollution in deep copy
osv·2026-03-17
CVE-2026-32878 [MEDIUM] Parse Server vulnerable to schema poisoning via prototype pollution in deep copy
Parse Server vulnerable to schema poisoning via prototype pollution in deep copy
### Impact
An attacker can bypass the default request keyword denylist protection and the class-level permission for adding fields by sending a crafted request that exploits prototype pollution in the deep copy mechanism. This allows injecting fields into class schemas that have field addition locked down, and can cause permanent schema type conflicts that cannot be resolved even with the master key.
### Patches
The vulnerable third-party deep copy library has been replaced with a built-in deep clone mechanism that handles prototype properties safely, allowing the existing denylist check to correctly detect and reject the prohibited keyword.
### Workarounds
None.
### Vulnerability Independence
This vul
GHSA
Parse Server vulnerable to schema poisoning via prototype pollution in deep copy
ghsa·2026-03-17
CVE-2026-32878 [MEDIUM] CWE-1321 Parse Server vulnerable to schema poisoning via prototype pollution in deep copy
Parse Server vulnerable to schema poisoning via prototype pollution in deep copy
### Impact
An attacker can bypass the default request keyword denylist protection and the class-level permission for adding fields by sending a crafted request that exploits prototype pollution in the deep copy mechanism. This allows injecting fields into class schemas that have field addition locked down, and can cause permanent schema type conflicts that cannot be resolved even with the master key.
### Patches
The vulnerable third-party deep copy library has been replaced with a built-in deep clone mechanism that handles prototype properties safely, allowing the existing denylist check to correctly detect and reject the prohibited keyword.
### Workarounds
None.
### Vulnerability Independence
This vul
No detection rules found.
No public exploits indexed.
2026-03-18
Published