PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-27366 MainWP CVE debrief

CVE-2026-27366 is a high-severity vulnerability in the MainWP Child plugin versions <= 6.1.1. It allows unauthenticated broken access control, potentially enabling attackers to access sensitive areas of the website without proper authentication. The vulnerability has a CVSS score of 7.5 and is considered HIGH severity. The CVE was published on June 25, 2026, and last modified on June 29, 2026. The vendor and product information is not clearly identified, but Patchstack is mentioned as a potential source of information about this vulnerability.

Vendor
MainWP
Product
MainWP Child
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-25
Original CVE updated
2026-06-29
Advisory published
2026-06-25
Advisory updated
2026-06-29

Who should care

Website administrators and security teams using the MainWP Child plugin versions <= 6.1.1 should prioritize patching this vulnerability to prevent potential unauthorized access. Additionally, security researchers and penetration testers may be interested in this vulnerability for testing and validation purposes.

Technical summary

The vulnerability is caused by unauthenticated broken access control in the MainWP Child plugin. This could allow an attacker to access sensitive areas of the website without proper authentication. The CVSS vector for this vulnerability is CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H. The weakness associated with this vulnerability is CWE-862.

Defensive priority

High priority should be given to patching this vulnerability, as it could allow unauthorized access to sensitive areas of the website. Administrators should update the MainWP Child plugin to a version that addresses this vulnerability.

Recommended defensive actions

  • Update the MainWP Child plugin to a version that addresses this vulnerability.
  • Review website access controls and authentication mechanisms to ensure they are properly configured.
  • Monitor website activity for potential unauthorized access attempts.
  • Consider implementing additional security measures, such as web application firewalls or intrusion detection systems.

Evidence notes

The CVE-2026-27366 vulnerability is based on information from official sources, including the CVE.org and NVD. The vulnerability is described as unauthenticated broken access control in the MainWP Child plugin versions <= 6.1.1. The CVSS score and vector are provided, along with the CWE weakness.

Official resources

This article is AI-assisted and based on the supplied source corpus.