Medium 6.3Published Apr 7, 2026

CVE-2026-39321Parse Server has a login timing side-channel reveals user existence

Updated under an hour ago (Oct 28, 2026, 8:10 AM ET)

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It affects parse-community parse-server and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for parse-community parse-server

Exploited in the last 30 days

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: 6.3 MEDIUM (v4.0, CNA)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
Weakness (CWE): CWE-208
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Apr 7, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

parse-community parse-server parse_community:parse_server (from the name)	from 9.0.0, < 9.8.0-alpha.6; before 8.6.74	CNA record
parseplatform parse-server parseplatform:parse-server	before 8.6.74; from 9.0.0 before 9.8.0; 9.8.0; 9.8.0; 9.8.0; 9.8.0; 9.8.0	NVD

References

References

https://github.com/parse-community/parse-server/security/advisories/GHSA-mmpq-5hcv-hf2v	x-refsource-confirm, mitigation, patch, vendor-advisory
https://github.com/parse-community/parse-server/pull/10398	x-refsource-misc, issue-tracking, patch
https://github.com/parse-community/parse-server/pull/10399	x-refsource-misc, issue-tracking, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.