CVE-2026-119569

Parse Server 9.0.0 before 9.10.5-alpha.9 Prototype Pollution Denial of Service

State: Published
Severity: 6.0 Medium
Published: Oct 30, 2026
Updated: Oct 30, 2026
Reserved: Oct 30, 2026

Description

Parse Server before 8.6.108 and 9.0.0 before 9.10.5-alpha.9 contains a prototype pollution vulnerability because user-controlled keys are expanded into objects without own-property checks. Clients with class write access can send dot notation field keys or ACL entry names matching built-in object members to corrupt built-in functions, causing all requests to fail until server restart.

Scores

CVSS	Score	Vector	Source
4.0	6.0 Medium	CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	VulnCheck
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H	VulnCheck

Weaknesses

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

Affected Products

Product	Versions
parse-serverparse-community	9.0.0 to before 9.10.5-alpha.9Affected 9.10.5-alpha.9Not affected
parse-serverparse-community	before 8.6.108Affected 8.6.108Not affected

References

GitHub Security Advisory (GHSA-rx55-fw4j-pvpx)vendor-advisory
VulnCheck Advisory: Parse Server 9.0.0 before 9.10.5-alpha.9 Prototype Pollution Denial of Servicethird-party-advisory

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.