CVE-2026-33877
CVE-2026-33877 · ApostropheCMS: User Enumeration via Timing Side Channel in Password Reset Endpoint
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 3.7 · Low · EPSS 0.4% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
apostrophe
- Versions
- < 4.29.0: Affected
No fix published
apostrophe npm
- Affected ranges
- SEMVER: < 4.29.0
Update to 4.29.0