MainWP Child < 6.1.2 - Unauthenticated Administrator Authentication Bypass via Passwordless Site Registration
Priority HIGH 70CWE-287Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-287.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00468 40th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed MainWP Child (Unknown): 6.1.2
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Unknown | MainWP Child | before 6.1.2 | 6.1.2 | Patch available | CNA |
- MainWP Child VendorUnknown Affected before 6.1.2 Fixed in 6.1.2 Patch available CNA
Remediation
- Fix · CNA MainWP Child (Unknown) Fixed in 6.1.2
Timeline
- 2026-10-02 Threatist record created from CVE-2026-12255
- 2026-10-03 Alias added: GHSA-4ph4-5rpm-wrw9
References
Sources
- CVE-2026-12255 · CVE Program
- CVE-2026-12255 · NVD
- FIRST EPSS
- GHSA-4ph4-5rpm-wrw9 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences