What is CVE-2026-119569?

CVE-2026-119569 is a medium-severity vulnerability in Parse-Community Parse-Server, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 5.3/10. Published 2026-10-30.

How severe is CVE-2026-119569?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Prototype Pollution in Parse-Community Parse-Server

CVE-2026-119569

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.

Vulnerability class: Prototype Pollution

Published 2026-10-30 · last modified 2026-10-30.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Parse-Community Parse-Server

Weakness classification (CWE)

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

References

github.com/parse-community/parse-server/security/advisories/GHSA-rx55-fw4j-pvpx (vendor-advisory)
www.vulncheck.com/advisories/parse-server-9.0.0-before-9.10.5-alpha.9-prototype… (third-party-advisory)

Frequently asked questions

What is CVE-2026-119569?: CVE-2026-119569 is a medium-severity vulnerability in Parse-Community Parse-Server, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 5.3/10. Published 2026-10-30.
How severe is CVE-2026-119569?: Medium severity. CVSS v3 base score is 5.3 out of 10.