Medium 5.3Published Mar 31, 2026

CVE-2026-34595Parse Server: LiveQuery protected-field guard bypass via array-like logical operator value

Updated under an hour ago (Oct 27, 2026, 5:50 PM 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 versions 8.6.70 and 9.7.0-alpha.18, an authenticated user with find class-level permission can bypass the protectedFields class-level permission setting on LiveQuery subscriptions. By sending a subscription with a $or, $and, or $nor operator value as a plain object with numeric keys and a length property (an "array-like" object) instead of an array, the protected-field guard is bypassed. The subscription event firing acts as a binary oracle, allowing the attacker to infer whether a protected field matches a given test value. This issue has been patched in versions 8.6.70 and 9.7.0-alpha.18.

CVSS: 5.3 MEDIUM (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness (CWE): CWE-843
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: Mar 31, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

parse-community parse-server parse_community:parse_server (from the name)	before 8.6.70; from 9.0.0, < 9.7.0-alpha.18	CNA record
parseplatform parse-server parseplatform:parse-server	before 8.6.70; from 9.0.0 before 9.7.0; 9.7.0; 9.7.0; 9.7.0; 9.7.0; 9.7.0; 9.7.0; and 9 more ranges	NVD

References

References

https://github.com/parse-community/parse-server/security/advisories/GHSA-mmg8-87c5-jrc2	x-refsource-confirm, patch, vendor-advisory
https://github.com/parse-community/parse-server/pull/10350	x-refsource-misc, issue-tracking, patch
https://github.com/parse-community/parse-server/pull/10351	x-refsource-misc, issue-tracking, patch
https://github.com/parse-community/parse-server/commit/f63fd1a3fe0a7c1c5fe809f01b0e04759e8c9b98	x-refsource-misc, patch
https://github.com/parse-community/parse-server/commit/ffad0ec6b971ee0dd9545e1bf1fb34ddebf275c2	x-refsource-misc, 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.