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CVE-2026-109303— Parse Server before 8.6.93 and 9.0.0 before 9.10.1-alpha.13 protectedFields Bypass via Relation Count Query

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 8.6.93 之前的版本以及 9.0.0 版本中 9.10.1-alpha.13 之前的版本，在使用 $relatedTo 操作符的 count 查询时，未强制实施基于身份的 protectedFields（认证用户、角色或 per-user 组）保护，从而暴露了受保护的 Relation 字段的大小。经过身份验证的用户如果有权读取被拥有的对象，就可以将 count 查询与 objectId 约束结合，用作成员身份预言机（membership oracle），以揭示保密的成员身份信息，例如

CVSS 4.3 · Medium

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 4

VendorProduct Version RangeStatus
parse-community parse-server 9.0.0< 9.10.1-alpha.13 affected
9.10.1-alpha.13 unaffected
< 8.6.93 affected
8.6.93 unaffected
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I. Basic Information for CVE-2026-109303

Vulnerability Information
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Vulnerability Title
Parse Server before 8.6.93 and 9.0.0 before 9.10.1-alpha.13 protectedFields Bypass via Relation Count Query
Source: CVE Program / CVE List V5
Vulnerability Description
Parse Server before 8.6.93 and 9.0.0 before 9.10.1-alpha.13 does not enforce identity-scoped protectedFields (authenticated, role, or per-user groups) on count queries using the $relatedTo operator, exposing the size of protected Relation fields. An authenticated user who can read the owning object can combine counts with an objectId constraint as a membership oracle to reveal confidential memberships such as private groups or block lists.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A: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

Affected Products

Vendor Product Affected Versions CPE Subscribe
parse-community parse-server 9.0.0 ~ 9.10.1-alpha.13 -
parse-community parse-server 0 ~ 8.6.93 -

II. Public POCs for CVE-2026-109303

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III. Intelligence Information for CVE-2026-109303

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Vendor Advisories for CVE-2026-109303 (2)

Same Patch Batch · parse-community · 2026-10-12 · 3 CVEs total

CVE-2026-109301 5.9 MEDIUM Parse Server before 8.6.95 and 9.0.0 before 9.10.2-alpha.3 Denial of Service via File Poin
CVE-2026-109302 3.7 LOW Parse Server 8.2.2 before 8.6.94 and 9.0.0 before 9.10.1-alpha.14 GraphQL Schema Disclosur

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-109303

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