Vulnerability · Published Mar 18, 2026 · Assigned by GitHub_M
CVE-2026-32878Parse Server vulnerable to schema poisoning via prototype pollution in deep copy
Medium 5.3
In plain English
A medium-severity prototype pollution in parse-server from parse-community. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | parse-server | 9.6.0-alpha.20 | GHSA-9ccr-fpp6-78qf |
| npm | parse-server | 8.6.44 | GHSA-9ccr-fpp6-78qf |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| parse-community | parse-server | >= 9.0.0, < 9.6.0-alpha.20< 8.6.44 |
Weakness: CWE-1321 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
References
- https://github.com/parse-community/parse-server/security/advisories/GHSA-9ccr-fpp6-78qf x_refsource_CONFIRM
- https://github.com/parse-community/parse-server/pull/10200 x_refsource_MISC
- https://github.com/parse-community/parse-server/pull/10201 x_refsource_MISC