Critical severity · published Mar 10, 2026
CVE-2026-30965
Parse Server session token exfiltration via `redirectClassNameForKey` query parameter
9.1
CVSS
1.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.4% · higher than 72% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PA
parse-server · parse-community
>= 9.0.0 < 9.5.2-alpha.8; < 8.6.21 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-30965
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-30965
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
Mitigation
https://github.com/parse-community/parse-server/security/advisories/GHSA-6r2j-cxgf-495f
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