CVE-2026-31901

EUVD-2026-11317
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.3 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Affected Products (NVD)
VendorProductVersion
parseplatformparse-server
𝑥
< 8.6.34
parseplatformparse-server
9.0.0 ≤
𝑥
< 9.6.0
parseplatformparse-server
9.6.0:alpha1
parseplatformparse-server
9.6.0:alpha2
parseplatformparse-server
9.6.0:alpha3
parseplatformparse-server
9.6.0:alpha4
parseplatformparse-server
9.6.0:alpha5
parseplatformparse-server
9.6.0:alpha6
parseplatformparse-server
9.6.0:alpha7
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://github.com/parse-community/parse-server/releases/tag/8.6.34
https://github.com/parse-community/parse-server/releases/tag/9.6.0-alpha.8
https://github.com/parse-community/parse-server/security/advisories/GHSA-w54v-hf9p-8856