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CVE-2026-33888— ApostropheCMS: publicApiProjection Bypass via `project` Query Builder in Piece-Type REST API

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@apostrophecms/piece-type模块的getRestQuery方法存在授权绕过，可能导致公开披露管理员明确限制的字段。

CVSS 5.3 · Medium EPSS 0.52% · P42
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I. Basic Information for CVE-2026-33888

Vulnerability Information
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Vulnerability Title
ApostropheCMS: publicApiProjection Bypass via `project` Query Builder in Piece-Type REST API
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 getRestQuery method of the @apostrophecms/piece-type module, where the method checks whether a MongoDB projection has already been set before applying the admin-configured publicApiProjection. An unauthenticated attacker can supply a project query parameter in the REST API request, which is processed by applyBuildersSafely before the permission check, pre-populating the projection state and causing the publicApiProjection to be skipped entirely. This allows disclosure of any field on publicly queryable documents that the administrator explicitly restricted from the public API, such as internal notes, draft content, or metadata. Exploitation is trivial, requiring only appending query parameters to a public URL with no authentication. 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
授权机制不正确
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@apostrophecms/piece-type模块的getRestQuery方法存在授权绕过，可能导致公开披露管理员明确限制的字段。
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-2026-33888

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III. Intelligence Information for CVE-2026-33888

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Patches & Fixes for CVE-2026-33888 (2)

Vendor Advisories for CVE-2026-33888 (1)

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

CVE-2026-35569 8.7 HIGH ApostropheCMS: Stored XSS in SEO Fields Leads to Authenticated API Data Exposure in Apostr
CVE-2026-40186 6.1 MEDIUM ApostropheCMS: sanitize-html allowedTags Bypass via Entity-Decoded Text in nonTextTags Ele
CVE-2026-33889 5.4 MEDIUM ApostropheCMS: Stored XSS via CSS Custom Property Injection in `@apostrophecms/color-field
CVE-2026-39857 5.3 MEDIUM Information Disclosure via `choices`/`counts` Query Parameters Bypassing publicApiProjecti
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-863

V. Comments for CVE-2026-33888

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