Vulnerability in Parse-Community Parse-Server
CVE-2026-39321
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (27.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 27.9% 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: +0.001
Affected products
- Parse-Community Parse-Server — versions >= 9.0.0, < 9.8.0-alpha.6, < 8.6.74
- Parseplatform Parse-Server — versions 9.8.0
Weakness classification (CWE)
References
- github.com/parse-community/parse-server/security/advisories/GHSA-mmpq-5hcv-hf2v (Patch, Mitigation, Vendor Advisory)
- github.com/parse-community/parse-server/pull/10398 (Patch, Issue Tracking)
- github.com/parse-community/parse-server/pull/10399 (Patch, Issue Tracking)
Frequently asked questions
- What is CVE-2026-39321?
- CVE-2026-39321 is a low-severity vulnerability in Parse-Community Parse-Server, classified under CWE-208. CVSS score: 3.7/10. Published 2026-04-07.
- How severe is CVE-2026-39321?
- Low severity. CVSS v3 base score is 3.7 out of 10.