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CVE-2026-34595

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

Published: Mar 31, 2026Updated: Jul 24, 2026 Sources: CVE List NVDCWE-843
4.3MEDIUM
NVD MITRE
EPSS Score
0.3%
Top 83.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

Description

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-843

Affected Products

parseplatform
oss-projectaka parse-community, parse, parse-server, parse server, parse platform
parse-serverLibraryLibrary
OSS Libraries / npm
and 1 more affected products View all →

Exploitability

Official Patch Available

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://github.com/parse-community/parse-server/security/advisories/GHSA-mmg8-87c5-jrc2
github.com
https://github.com/parse-community/parse-server/pull/10350
github.com
https://github.com/parse-community/parse-server/pull/10351
github.com
and 2 more references View all →

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