CVE-2026-64664
Impact
An authenticated Control Panel user could use an endpoint intended for the user creation wizard to determine if a given email address belongs to an existing user, without having permission to view users.
The endpoint only exposed user existence, not any of its data.
Patches
This has been fixed in 5.74.1 and 6.24.0.
⚡ Watch CVE-2026-64664
Get an email if CVE-2026-64664 is added to CISA KEV, gains public exploit code, or a new advisory cites it — max one per day, one-click unsubscribe.
Advisory coverage (2)
External references
Embed the live status
— this badge updates automatically when the KEV or exploit status changes. How to embed it →
[](https://www.csirts.com/cve/CVE-2026-64664)