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CVE

CVE-2026-30965

Parse Server session token exfiltration via `redirectClassNameForKey` query parameter
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CVE

CVE-2026-30965

Parse Server session token exfiltration via `redirectClassNameForKey` query parameter

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.9
-
4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
9.1
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Related Resources

No items found.

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/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30965.json, https://github.com/parse-community/parse-server/security/advisories/GHSA-6r2j-cxgf-495f, https://nvd.nist.gov/vuln/detail/CVE-2026-30965

Severity

0

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
0
EPSS Probability
0.00088%
EPSS Percentile
0.25187%
Introduced Version
0
Fix Available
cb07a353b1843083aad6e690f3438883ce442247

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