CVE-2026-39321

MEDIUM EPSS 13.7%
Published Apr 7, 20262mo ago · Modified Jun 17, 20261w ago
6.3 CVSS 4.0
Medium
Find Similar
Published Apr 7, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago

Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.8.0-alpha.6 and 8.6.74, he login endpoint response time differs measurably depending on whether the submitted username or email exists in the database. When a user is not found, the server responds immediately. When a user exists but the password is wrong, a bcrypt comparison runs first, adding significant latency. This timing difference allows an unauthenticated attacker to enumerate valid usernames. This vulnerability is fixed in 9.8.0-alpha.6 and 8.6.74.

CVSS Details

Base Score
6.3
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/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
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
13.7% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-208

Affected Products 7

VendorProductVersionRange
parseplatformparse-server* <8.6.74
parseplatformparse-server*≥9.0.0  –  <9.8.0
parseplatformparse-server9.8.0any
parseplatformparse-server9.8.0any
parseplatformparse-server9.8.0any
parseplatformparse-server9.8.0any
parseplatformparse-server9.8.0any

References 3

  • github.com https://github.com/parse-community/parse-server/pull/10398
    Issue TrackingPatch
  • github.com https://github.com/parse-community/parse-server/pull/10399
    Issue TrackingPatch
  • github.com https://github.com/parse-community/parse-server/security/advisories/GHSA-mmpq-5hcv-hf2v
    MitigationPatchVendor Advisory

Remediation

  • github.com https://github.com/parse-community/parse-server/pull/10398
    Issue TrackingPatch
  • github.com https://github.com/parse-community/parse-server/pull/10399
    Issue TrackingPatch
  • github.com https://github.com/parse-community/parse-server/security/advisories/GHSA-mmpq-5hcv-hf2v
    MitigationPatchVendor Advisory