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.

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.

EPSS: 0.002 (14.0th percentile) — read the EPSS interpretation.

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.

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)

CWE-208

References

security-advisories@github.com (x_refsource_CONFIRM, Patch, Mitigation, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC, Issue Tracking)
security-advisories@github.com (Patch, x_refsource_MISC, 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.