CVE-2026-31901
March 11, 2026
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 8.6.34 and 9.6.0-alpha.8, the email verification endpoint (/verificationEmailRequest) returns distinct error responses depending on whether an email address belongs to an existing user, is already verified, or does not exist. An attacker can send requests with different email addresses and observe the error codes to determine which email addresses are registered in the application. This is a user enumeration vulnerability that affects any Parse Server deployment with email verification enabled (verifyUserEmails: true). This vulnerability is fixed in 8.6.34 and 9.6.0-alpha.8.
Affected Packages
https://github.com/parse-community/parse-server.git (GITHUB):
Affected version(s) >=8.0.0 <8.6.34Fix Suggestion:
Update to version 8.6.34https://github.com/parse-community/parse-server.git (GITHUB):
Affected version(s) >=9.0.0-alpha.1 <9.6.0-alpha.8Fix Suggestion:
Update to version 9.6.0-alpha.8parse-server (NPM):
Affected version(s) >=1.0.0 <8.6.34Fix Suggestion:
Update to version 8.6.34parse-server (NPM):
Affected version(s) >=9.0.0-alpha.1 <9.6.0-alpha.8Fix Suggestion:
Update to version 9.6.0-alpha.8Related Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Observable Response Discrepancy
EPSS
Base Score:
0.04
