MainWP Child registration can create administrator sessions without authentication
MainWP Child before 6.1.2 fails to verify the requester's identity in its site-registration handler when password authentication is disabled for the named target account. An unauthenticated attacker can identify an existing username, including an administrator, and obtain an authenticated session for that user in a single registration request. The CNA record does not disclose the handler, username parameter or session-creation function.
- Component
- MainWP Child
- Plugin slug
mainwp-child- Affected
- < 6.1.2
- Safe version
6.1.2- Published
- Jul 27, 2026
This CVE was published Jul 27, 2026 and is one of 5 known issues for this plugin.
Update, patch or deactivate.
Update MainWP Child to 6.1.2 or later. Invalidate active sessions, review administrator activity and connected MainWP sites, rotate WordPress salts and privileged credentials if a vulnerable release was publicly reachable.
A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical description
The MainWP Child WordPress plugin before 6.1.2 does not verify the requester's identity in its site-registration request handler when password authentication has been disabled for the targeted account, allowing an unauthenticated attacker to obtain a valid authentication session as that account, including an administrator, by naming its login in a single registration request.
CVE / CNA vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H