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CVE-2026-53726— Parse Server: Relation `$relatedTo` query bypasses `protectedFields` and owning-object ACL

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 Platform Parse Server是Parse Platform组织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 Platform parse server 8.6.80之前版本和9.9.1-alpha.6之前版本存在授权问题漏洞，该漏洞源于使用$relatedTo操作符的关系查询问题，可能导致未经身份验证的客户端枚举受保护关系中的对象或确认对象与私有父对象关联。

AI Predicted 7.5 Difficulty: Easy EPSS 0.28% · P20

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 2

VendorProduct Version RangeStatus
parse-community parse-server < 8.6.80 affected
>= 9.0.0, < 9.9.1-alpha.6 affected
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I. Basic Information for CVE-2026-53726

Vulnerability Information
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Vulnerability Title
Parse Server: Relation `$relatedTo` query bypasses `protectedFields` and owning-object ACL
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 8.6.80 and 9.9.1-alpha.6, a relation query using the $relatedTo operator could read the membership of a Relation field even when that field was hidden from the requesting client by protectedFields, and even when the object owning the relation was not readable by the client under its ACL or class-level permissions. The request requires only the public API credentials that Parse clients normally carry — no user session, master key, or Cloud Code is needed. As a result, an unauthenticated client who knows or obtains the owning object's objectId could enumerate the objects linked through a protected relation, or combine the operator with an objectId constraint to use it as a membership oracle — confirming whether a specific object is linked to a private parent. This affects applications that rely on protectedFields or object ACLs to keep Relation membership confidential, such as private group memberships, block lists, or account-to-resource associations. This issue has been patched in versions 8.6.80 and 9.9.1-alpha.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
Parse Platform parse server 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Parse Platform Parse Server是Parse Platform组织开源的一个开源后端,可以部署到任何可以运行 Node.js 的基础设施。 Parse Platform parse server 8.6.80之前版本和9.9.1-alpha.6之前版本存在授权问题漏洞，该漏洞源于使用$relatedTo操作符的关系查询问题，可能导致未经身份验证的客户端枚举受保护关系中的对象或确认对象与私有父对象关联。
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 < 8.6.80 -

II. Public POCs for CVE-2026-53726

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III. Intelligence Information for CVE-2026-53726

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Patches & Fixes for CVE-2026-53726 (2)

Vendor Advisories for CVE-2026-53726 (1)

Same Patch Batch · parse-community · 2026-06-12 · 6 CVEs total

CVE-2026-53724 Parse Server: Stored XSS via trailing-dot filename bypassing file upload extension blockli
CVE-2026-53725 Parse Server: Endpoints `/login` and `/verifyPassword` disclose MFA secrets and protected
CVE-2026-47248 Parse Server: GraphQL "Did you mean" validation suggestions disclose schema to unauthentic
CVE-2026-47138 Parse Server: Pre-authentication denial of service via client version header regex backtra
CVE-2026-50008 Parse Server: Server option routeAllowList is bypassable through batch sub-requests

IV. Related Vulnerabilities

Same product: parse-server
Same vendor: parse-community
Same weakness: CWE-639

V. Comments for CVE-2026-53726

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