CVE-2026-30965

Parse Server session token exfiltration via `redirectClassNameForKey` query parameter

CVSS 9.9 CRITICALEPSS 0.4%CWE-863

Vexday Risk Score

28Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 9.9EPSS 0.4%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

10 Mar 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N

Affected products

parse-community · parse-server

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References

https://github.com/parse-community/parse-server/releases/tag/8.6.21 https://github.com/parse-community/parse-server/releases/tag/9.5.2-alpha.8 https://github.com/parse-community/parse-server/security/advisories/GHSA-6r2j-cxgf-495f