CVE-2026-27390: 
WordPress vulnerability analysis and mitigation

CVE-2026-27390 is an Authentication Bypass Using an Alternate Path or Channel vulnerability (CWE-288) in the WeDesignTech Ultimate Booking Addon WordPress plugin by designthemes. It affects all versions up to and including 1.0.1 and allows low-privileged authenticated attackers to abuse authentication mechanisms, potentially leading to account takeover. The vulnerability was published on March 5, 2026, and was reported via Patchstack. It carries a CVSS v3.1 base score of 8.8 (High) (Feedly, Patchstack).

The vulnerability is classified under CWE-288 (Authentication Bypass Using an Alternate Path or Channel), meaning the plugin fails to properly enforce authentication controls and can be circumvented via an alternate path or channel. An attacker with low-level privileges can exploit this flaw to abuse the authentication process without requiring user interaction, operating entirely over the network with low attack complexity. The specific alternate path or channel exploited has not been publicly detailed in available sources, but the vulnerability class typically involves bypassing authentication checks through unprotected endpoints, direct object references, or alternative code paths not subject to the same access controls (Feedly, Patchstack).

Successful exploitation can result in full account takeover, granting the attacker high-level access to confidentiality, integrity, and availability of the affected WordPress site. An attacker could access sensitive user and booking data, modify or delete booking records, and potentially disrupt service availability for legitimate users. Given the WordPress plugin context, a compromised account could also serve as a foothold for further lateral movement within the hosting environment (Feedly).

There is currently no public proof-of-concept exploit code available, and no evidence of active in-the-wild exploitation has been reported. The vulnerability has an EPSS score of approximately 0.024%, indicating a low probability of exploitation in the near term. It has not been added to the CISA Known Exploited Vulnerabilities (KEV) catalog. The vulnerability was assigned and disclosed by Patchstack (Feedly, Patchstack).

No patch has been confirmed as available for the WeDesignTech Ultimate Booking Addon at the time of disclosure. Administrators should take the following steps:

• Inventory: Identify all WordPress installations running the wedesigntech-ultimate-booking-addon plugin at version 1.0.1 or earlier.
• Disable the plugin: If the booking functionality is not critical, deactivate and remove the plugin until a patched version is released.
• Access controls: Restrict low-privilege user account creation and monitor for unexpected privilege escalation.
• Monitor logs: Review WordPress authentication and access logs for unusual login patterns or account changes.
• Contact vendor: Reach out to designthemes or monitor Patchstack for an updated, patched release (Feedly, Patchstack).

The vulnerability was noted in the Wordfence Intelligence Weekly WordPress Vulnerability Report covering the period of February 23 to March 1, 2026, indicating it received standard industry tracking attention. No significant researcher commentary or broader media coverage has been identified beyond routine vulnerability database entries (Wordfence).