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Fencer Vulns
critical 9.1

CVE-2026-30965 json

Parse Server session token exfiltration via `redirectClassNameForKey` query parameter

published 2026-03-10 8 mo ago modified 2026-09-08 2 mo ago also BIT-parse-2026-30965 , EUVD-2026-10880 , GHSA-6r2j-cxgf-495f

cvss
9.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.5%
EPSS 1.5% chance of exploitation in 30 days, percentile 73%
public exploits
0
none known, plus a Nuclei check

Summary

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.

Patch / fix

  • npm parse-server 8.6.21, 9.5.2-alpha.8
  • bitnami parse 8.6.21, 9.5.2
  • parseplatform parse-server 8.6.21, 9.5.2-alpha.8
  • parseplatform parse_server 8.6.21, 9.5.2-alpha.8

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
7 mo ago

Exploit prediction

1.45% chance of exploitation in the next 30 days, higher than 73% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Nuclei template Parse Server < 8.6.21 / 9.x < 9.5.2 - Session Token Exfiltration nuclei detection template

CVSS scores

assigned by version score vector
CNA 4.0 9.9 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
CNA 4.0 9.9 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
NVD 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
npm parse-server
>=9.0.0-alpha.1, <9.5.2-alpha.8
<8.6.21
9.5.2-alpha.8
8.6.21
bitnami parse
<8.6.21
>=9.0.0, <9.5.2
8.6.21
9.5.2

Affected products

  • parse-community parse-server

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.