CVE-2026-39321

Name: CVE-2026-39321
Creator: NVD / NIST
Published: 2026-04-07T18:16:43.09+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.3/10EPSS 0.23%

Last modified Jun 17, 2026

CVE-2026-39321 is a medium-severity vulnerability rated 6.3/10 on the CVSS scale. 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. EPSS estimates a 0.23% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

3.7/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS 4.0

6.3/10

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.23%

13.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-208

Affected Software

Vendor	Product	Versions	Update
Parseplatform	Parse-Server	< 8.6.74	—
Parseplatform	Parse-Server	>= 9.0.0, < 9.8.0	—
Parseplatform	Parse-Server	9.8.0	Alpha1

References

https://github.com/parse-community/parse-server/pull/10398Issue Tracking, Patch
https://github.com/parse-community/parse-server/pull/10399Issue Tracking, Patch
https://github.com/parse-community/parse-server/security/advisories/GHSA-mmpq-5hcv-hf2vMitigation, Patch, Vendor Advisory

Timeline

Published: Apr 7, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-39321?

How severe is CVE-2026-39321?

CVE-2026-39321 has a CVSS score of 6.3/10 (MEDIUM severity). The EPSS model estimates a 0.23% probability of exploitation in the next 30 days.

How do I fix CVE-2026-39321?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-39321?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST