CVE-2026-30965 PoC — Parse Server session token exfiltration via `redirectClassNameForKey` query parameter

Source

https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-30965.yaml

Associated Vulnerability

Title: Parse Server session token exfiltration via `redirectClassNameForKey` query parameter (CVE-2026-30965)
Description: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.

Description

Parse Server < 8.6.21 / 9.x < 9.5.2 contains an information disclosure vulnerability caused by improper handling of the redirectClassNameForKey query parameter, letting authenticated or unauthenticated attackers exfiltrate session tokens, exploit requires ability to create or update an object with a new relation field depending on Class-Level Permissions.

File Snapshot

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