Is CVE-2026-121965 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-121965 being exploited in the wild.

How severe is CVE-2026-121965?

Medium severity, with a CVSS score of 5.3, published 4 November 2026.

Which products and versions are affected?

Parse Community Parse Server before 8.6.113 and 9.0.0 before 9.10.6-alpha.5.

Is there a fix for CVE-2026-121965?

Yes: fixed in Parse Server 8.6.113, 9.10.6-alpha.5. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-121965 attacked?

It is attacked over the network.

Am I affected by CVE-2026-121965?

Check whether you run Parse Community Parse Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-121965: Parse Server prototype pollution in Cloud Code and LiveQuery

CVE-2026-121965 · Severity: medium · CVSS 5.3 · Published 2026-11-04

Parse Server is a backend-as-a-service platform that powers cloud applications and handles data storage. A prototype pollution vulnerability allows attackers with write access to corrupt shared built-in functions, causing unrelated requests to fail and denying service to all applications until the server is restarted. This can impact availability across all hosted applications on the affected server.

Technologies: Parse Community Parse Server. Vendors: Parse Community.

Quick answers

Is CVE-2026-121965 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-121965 being exploited in the wild.
How severe is CVE-2026-121965?: Medium severity, with a CVSS score of 5.3, published 4 November 2026.
Which products and versions are affected?: Parse Community Parse Server before 8.6.113 and 9.0.0 before 9.10.6-alpha.5.
Is there a fix for CVE-2026-121965?: Yes: fixed in Parse Server 8.6.113, 9.10.6-alpha.5. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-121965 attacked?: It is attacked over the network.
Am I affected by CVE-2026-121965?: Check whether you run Parse Community Parse Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: Parse Server 8.6.113, 9.10.6-alpha.5

Technical details

The vulnerability is a prototype pollution flaw in object building for Cloud Code triggers and LiveQuery. When a dot notation key with an intermediate segment resolves through an inherited member, it writes onto a process-wide built-in object. Attackers must have write access to an object in a class with a trigger or LiveQuery enabled; the fix prevents this by properly validating and sanitizing dot notation keys during object construction.

Affected products

Parse Community Parse Server before 8.6.113 and 9.0.0 before 9.10.6-alpha.5

Timeline

2026-11-04: disclosed
2026-10-20: patched

References

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