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CVE-2026-33877— ApostropheCMS: User Enumeration via Timing Side Channel in Password Reset Endpoint

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，该漏洞源于密码重置端点存在时序侧信道漏洞，可能导致未经验证的用户名和电子邮件枚举。

CVSS 3.7 · Low EPSS 0.32% · P23
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I. Basic Information for CVE-2026-33877

Vulnerability Information
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Vulnerability Title
ApostropheCMS: User Enumeration via Timing Side Channel in Password Reset Endpoint
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 a timing side-channel vulnerability in the password reset endpoint (/api/v1/@apostrophecms/login/reset-request) that allows unauthenticated username and email enumeration. When a user is not found, the handler returns after a fixed 2-second artificial delay, but when a valid user is found, it performs a MongoDB update and SMTP email send with no equivalent delay normalization, producing measurably different response times. The endpoint also accepts both username and email via an $or query, and has no rate limiting as the existing checkLoginAttempts throttle only applies to the login flow. This enables automated enumeration of valid accounts for use in credential stuffing or targeted phishing. Only instances that have explicitly enabled the passwordReset option are affected, as it defaults to false. This issue has been fixed in version 4.29.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过时间差异性导致的信息暴露
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，该漏洞源于密码重置端点存在时序侧信道漏洞，可能导致未经验证的用户名和电子邮件枚举。
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-2026-33877

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III. Intelligence Information for CVE-2026-33877

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Patches & Fixes for CVE-2026-33877 (1)

Vendor Advisories for CVE-2026-33877 (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-2026-33888 5.3 MEDIUM ApostropheCMS: publicApiProjection Bypass via `project` Query Builder in Piece-Type REST A

IV. Related Vulnerabilities

Same product: apostrophe
Same vendor: apostrophecms
Same weakness: CWE-208

V. Comments for CVE-2026-33877

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