CVE-2026-30965

moderate-risk

Published 2026-03-10

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.5.2-alpha.8 and 8.6.21, a vulnerability in Parse Server's query handling allows an authenticated or unauthenticated attacker to exfiltrate session tokens of other users by exploiting the redirectClassNameForKey query parameter. Exfiltrated session tokens can be used to take over user accounts. The vulnerability requires the attacker to be able to create or update an object with a new relation field, which depends on the Class-Level Permissions of at least one class. This vulnerability is fixed in 9.5.2-alpha.8 and 8.6.21.

Do I need to act?

0.08% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 9.1/10 Critical

NETWORK / LOW complexity

Affected Products (8)

Parse-Server

Affected Vendors

Parseplatform

References (3)

Product https://github.com/parse-community/parse-server/releases/tag/8.6.21

Product https://github.com/parse-community/parse-server/releases/tag/9.5.2-alpha.8

Vendor Advisory https://github.com/parse-community/parse-server/security/advisories/GHSA-6r2j-cx...

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moderate-risk

Severity 31/34 · Critical

Exploitability 0/34 · Minimal

Exposure 14/34 · Moderate