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CVE-2026-39321

Parse Server has a login timing side-channel reveals user existence

Published: Apr 7, 2026Updated: Apr 15, 2026 Sources: CVE List NVDCWE-208
NVD MITRE
3.7CVSSLOW
EPSS Score
0.2%
Top 86.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-208

Affected Products

parse-serverparseplatform
LibraryLibrary
OSS Libraries / generic-library
parse-serverparse-community
LibraryLibrary
OSS Libraries / npm
parseplatformoss-projectOSS Librariesaka parse platform
parse-communityoss-projectOSS Librariesaka parse, parse server, parse-server

Exploitability

Official Patch Available
Workaround Available

References

https://github.com/parse-community/parse-server/pull/10398
github.com
https://github.com/parse-community/parse-server/pull/10399
github.com
https://github.com/parse-community/parse-server/security/advisories/GHSA-mmpq-5hcv-hf2v
github.com

Timeline

Published
Apr 7, 2026
Last Updated
Apr 15, 2026

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