CVE-2026-33877
published 2026-04-15CVE-2026-33877: 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…
PriorityP418low3.7CVSS 3.1
AVNACHPRNUINSUCLINAN
EPSS
0.36%
28.4th percentile
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.
Affected
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| apostrophecms | apostrophe | < 4.29.0 | 4.29.0 |
| apostrophecms | apostrophe | >= 0 < 4.29.0 | 4.29.0 |
| apostrophecms | apostrophecms | < 4.29.0 | 4.29.0 |
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VulDB
apostrophecms apostrophe up to 4.28.x Endpoint reset-request timing discrepancy (GHSA-mj7r-x3h3-7rmr)
vuldb·2026-04-16·CVSS 3.7
CVE-2026-33877 [LOW] apostrophecms apostrophe up to 4.28.x Endpoint reset-request timing discrepancy (GHSA-mj7r-x3h3-7rmr)
A vulnerability was found in apostrophecms apostrophe up to 4.28.x. It has been rated as problematic. Affected by this vulnerability is an unknown functionality of the file /api/v1/@apostrophecms/login/reset-request of the component Endpoint. Performing a manipulation results in observable timing discrepancy.
This vulnerability is cataloged as CVE-2026-33877. It is possible to initiate the attack remotely. There is no exploit available.
Upgrading the affected component is advised.
GHSA
ApostropheCMS: User Enumeration via Timing Side Channel in Password Reset Endpoint
ghsa·2026-04-16
CVE-2026-33877 [LOW] CWE-208 ApostropheCMS: User Enumeration via Timing Side Channel in Password Reset Endpoint
ApostropheCMS: User Enumeration via Timing Side Channel in Password Reset Endpoint
## Summary
The password reset endpoint (`/api/v1/@apostrophecms/login/reset-request`) exhibits a measurable timing side channel that allows unauthenticated attackers to enumerate valid usernames and email addresses. 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 database writes and SMTP operations with no equivalent delay normalization, producing a distinguishable timing profile.
## Details
The `resetRequest` handler in `modules/@apostrophecms/login/index.js` attempts to obscure the user-not-found path with an artificial delay, but fails to normalize the timing of the user-found path:
**User not found — fixed 2000ms dela
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2026-04-15
Published