Vulnerability in Parse-Community Parse-Server
CVE-2026-31901
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (32.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 32.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002
Affected products
- Parse-Community Parse-Server — versions >= 9.0.0 < 9.6.0-alpha.8, < 8.6.34
- Parseplatform Parse-Server — versions 9.6.0
Weakness classification (CWE)
References
- github.com/parse-community/parse-server/security/advisories/GHSA-w54v-hf9p-8856 (Patch, Vendor Advisory)
- github.com/parse-community/parse-server/releases/tag/8.6.34 (Product, Release Notes)
- github.com/parse-community/parse-server/releases/tag/9.6.0-alpha.8 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-31901?
- CVE-2026-31901 is a medium-severity vulnerability in Parse-Community Parse-Server, classified under Observable Response Discrepancy. CVSS score: 5.3/10. Published 2026-03-11.
- How severe is CVE-2026-31901?
- Medium severity. CVSS v3 base score is 5.3 out of 10.