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CVE-2026-34363— Parse Server: LiveQuery protected field leak via shared mutable state across concurrent subscribers

Quick assessment

Affected
parse-community parse-server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Parse Server是Parse Platform开源的一个开源后端，可以部署到任何可以运行 Node.js 的基础设施。 Parse Server 8.6.65之前版本和9.7.0-alpha.9之前版本存在竞争条件问题漏洞，该漏洞源于敏感数据过滤器对共享可变对象进行就地修改，可能导致受保护字段和身份验证数据泄露。

AI Predicted 7.5 Difficulty: Easy EPSS 0.37% · P30

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2026-34363

Vulnerability Information
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Vulnerability Title
Parse Server: LiveQuery protected field leak via shared mutable state across concurrent subscribers
Source: CVE Program / CVE List V5
Vulnerability Description
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.65 and 9.7.0-alpha.9, when multiple clients subscribe to the same class via LiveQuery, the event handlers process each subscriber concurrently using shared mutable objects. The sensitive data filter modifies these shared objects in-place, so when one subscriber's filter removes a protected field, subsequent subscribers may receive the already-filtered object. This can cause protected fields and authentication data to leak to clients that should not see them, or cause clients that should see the data to receive an incomplete object. Additionally, when an afterEvent Cloud Code trigger is registered, one subscriber's trigger modifications can leak to other subscribers through the same shared mutable state. Any Parse Server deployment using LiveQuery with protected fields or afterEvent triggers is affected when multiple clients subscribe to the same class. This issue has been patched in versions 8.6.65 and 9.7.0-alpha.9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: CVE Program / CVE List V5
Vulnerability Title
Parse Server 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Parse Server是Parse Platform开源的一个开源后端，可以部署到任何可以运行 Node.js 的基础设施。 Parse Server 8.6.65之前版本和9.7.0-alpha.9之前版本存在竞争条件问题漏洞，该漏洞源于敏感数据过滤器对共享可变对象进行就地修改，可能导致受保护字段和身份验证数据泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
parse-community parse-server < 8.6.65 -

II. Public POCs for CVE-2026-34363

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III. Intelligence Information for CVE-2026-34363

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Patches & Fixes for CVE-2026-34363 (2)

Vendor Advisories for CVE-2026-34363 (1)

Same Patch Batch · parse-community · 2026-03-31 · 9 CVEs total

CVE-2026-34373 Parse Server: GraphQL API endpoint ignores CORS origin restriction
CVE-2026-34573 Parse Server: GraphQL complexity validator exponential fragment traversal DoS
CVE-2026-34224 Parse Server: MFA single-use token bypass via concurrent authData login requests
CVE-2026-34595 Parse Server: LiveQuery protected-field guard bypass via array-like logical operator value
CVE-2026-34784 Parse Server: Streaming file download bypasses afterFind file trigger authorization
CVE-2026-34532 Parse Server: Cloud function validator bypass via prototype chain traversal
CVE-2026-34215 Parse Server: Auth data exposed via verify password endpoint
CVE-2026-34574 Parse Server: Session field immutability bypass via falsy-value guard

IV. Related Vulnerabilities

Same product: parse-server
Same vendor: parse-community
Same weakness: CWE-362

V. Comments for CVE-2026-34363

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