Vulnerability · Published Mar 11, 2026 · Assigned by GitHub_M

CVE-2026-31901Parse Server has user enumeration via email verification endpoint

Medium 6.3

In plain English

A medium-severity security flaw in parse-server from parse-community. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.3Medium

Exploit odds (30 days)0.3%top 79.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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 & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	parse-server	9.6.0-alpha.8	GHSA-w54v-hf9p-8856
npm	parse-server	8.6.34	GHSA-w54v-hf9p-8856

Affected products (as reported)

Vendor	Product	Versions
parse-community	parse-server	>= 9.0.0 < 9.6.0-alpha.8< 8.6.34

Weakness: CWE-204 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

References

https://github.com/parse-community/parse-server/security/advisories/GHSA-w54v-hf9p-8856 x_refsource_CONFIRM
https://github.com/parse-community/parse-server/releases/tag/8.6.34 x_refsource_MISC
https://github.com/parse-community/parse-server/releases/tag/9.6.0-alpha.8 x_refsource_MISC