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CVE-2026-39857— Information Disclosure via `choices`/`counts` Query Parameters Bypassing publicApiProjection Field Restrictions

Quick assessment

Affected
apostrophecms apostrophe
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.

ApostropheCMS是Apostrophe Technologies开源的一个全栈内容管理系统。 ApostropheCMS 4.28.0及之前版本存在安全漏洞，该漏洞源于REST API的choices和counts查询参数存在授权绕过，可能导致公开披露所有不同的字段值。

CVSS 5.3 · Medium EPSS 0.38% · P30
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I. Basic Information for CVE-2026-39857

Vulnerability Information
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Vulnerability Title
Information Disclosure via `choices`/`counts` Query Parameters Bypassing publicApiProjection Field Restrictions
Source: CVE Program / CVE List V5
Vulnerability Description
ApostropheCMS is an open-source Node.js content management system. Versions 4.28.0 and prior contain an authorization bypass vulnerability in the choices and counts query parameters of the REST API, where these query builders execute MongoDB distinct() operations that bypass the publicApiProjection restrictions intended to limit which fields are exposed publicly. The choices and counts parameters are processed via applyBuildersSafely before the projection is applied, and MongoDB's distinct operation does not respect projections, returning all distinct values directly. The results are returned in the API response without any filtering against publicApiProjection or removeForbiddenFields. An unauthenticated attacker can extract all distinct field values for any schema field type that has a registered query builder, including string, integer, float, select, boolean, date, slug, and relationship fields. Fields protected with viewPermission are similarly exposed, and the counts variant additionally reveals how many documents have each distinct value. Both the piece-type and page REST APIs are affected. This issue has been fixed in version 4.29.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
ApostropheCMS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ApostropheCMS是Apostrophe Technologies开源的一个全栈内容管理系统。 ApostropheCMS 4.28.0及之前版本存在安全漏洞，该漏洞源于REST API的choices和counts查询参数存在授权绕过，可能导致公开披露所有不同的字段值。
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
apostrophecms apostrophe < 4.29.0 -

II. Public POCs for CVE-2026-39857

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III. Intelligence Information for CVE-2026-39857

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Patches & Fixes for CVE-2026-39857 (1)

Vendor Advisories for CVE-2026-39857 (1)

Same Patch Batch · apostrophecms · 2026-04-15 · 6 CVEs total

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CVE-2026-33889 5.4 MEDIUM ApostropheCMS: Stored XSS via CSS Custom Property Injection in `@apostrophecms/color-field
CVE-2026-33888 5.3 MEDIUM ApostropheCMS: publicApiProjection Bypass via `project` Query Builder in Piece-Type REST A
CVE-2026-33877 3.7 LOW ApostropheCMS: User Enumeration via Timing Side Channel in Password Reset Endpoint

IV. Related Vulnerabilities

Same product: apostrophe
Same vendor: apostrophecms
Same weakness: CWE-200

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