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CVE-2026-34595

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

MEDIUM
4.3
CVSS Score
Published: March 31, 2026 at 03:10 PM UTC
Updated: July 24, 2026 at 08:20 PM UTC
2 products affected across 2 vendorsParse ServerParse Server

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Severity
MEDIUM4.3
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Parse Server· Parseplatformnpm
95%
v < 8.6.709.0.0 ≤ v < 9.7.09.7.0 alpha19.7.0 alpha109.7.0 alpha119.7.0 alpha129.7.0 alpha139.7.0 alpha149.7.0 alpha159.7.0 alpha29.7.0 alpha39.7.0 alpha49.7.0 alpha59.7.0 alpha69.7.0 alpha79.7.0 alpha89.7.0 alpha9
Affected range stops below 8.6.70, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.7.0, so it looks safe — our inference, not a vendor statement
Parse Server· Parse Communitynpm
60%
v < 8.6.70v < 9.7.0-alpha.18
Affected range stops below 8.6.70, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.7.0-alpha.18, so it looks safe — our inference, not a vendor statement

References (5)

x_refsource_CONFIRMPatchVendor Advisory
Source: cverecord
https://github.com/parse-community/parse-server/security/advisories/GHSA-mmg8-87c5-jrc2
x_refsource_MISCIssue TrackingPatch
Source: cverecord
https://github.com/parse-community/parse-server/pull/10350
x_refsource_MISCIssue TrackingPatch
Source: cverecord
https://github.com/parse-community/parse-server/pull/10351
x_refsource_MISCPatch
Source: cverecord
https://github.com/parse-community/parse-server/commit/f63fd1a3fe0a7c1c5fe809f01b0e04759e8c9b98
x_refsource_MISCPatch
Source: cverecord
https://github.com/parse-community/parse-server/commit/ffad0ec6b971ee0dd9545e1bf1fb34ddebf275c2

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.3MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-843

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