CVE-2026-32878

Parse Server vulnerable to schema poisoning via prototype pollution in deep copy

MEDIUM 5.3

At a glance

Source: NVD
EPSS: EPSS 0.36 % · percentile 29 (2026-10-28)
State: PUBLISHED
Published: 2026-03-18 21:40 UTC
Updated: 2026-03-19 16:13 UTC
Assigner: GitHub_M
NVD status: Analyzed

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.

Weaknesses (CWE)

CWE-1321 — Improperly Controlled Modification of Object Prototype (Prototype Pollution)

References

Scores

Version	Score	Vector	Scored by
CVSS 4.0	MEDIUM 5.3	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	GitHub_M
CVSS 4.0	MEDIUM 5.3	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/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	NVD · security-advisories@github.com (Secondary)
CVSS 3.1	HIGH 7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N	NVD · nvd@nist.gov (Primary)

Advisories

GHSA-9ccr-fpp6-78qf — Parse Server vulnerable to schema poisoning via prototype pollution in deep copy

European references

ENISA EUVD · EUVD-2026-12987
GCVE · GCVE-0-2026-32878

Affected configurations (NVD CPE)

cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:* < 8.6.44
cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:* ≥ 9.0.0 < 9.6.0
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha1:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha10:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha11:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha12:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha13:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha14:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha15:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha16:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha17:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha18:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha19:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha2:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha3:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha4:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha5:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha6:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha7:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha8:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha9:*:*:*:node.js:*:*

Affected products

Product	Versions
parse-community · parse-server	affected >= 9.0.0, < 9.6.0-alpha.20 ; affected < 8.6.44

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD