CVE-2026-15038 in Client Plugin
Summary
by MITRE • 08/09/2026
The InfiniteWP Client WordPress plugin before 1.13.6 does not properly verify the site-connection state and the authenticity of requests to its remote-management endpoint on WordPress Multisite installations, allowing unauthenticated attackers to bind their own key, hijack an administrator session, and take over the entire network, leading to remote code execution.
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Analysis
by VulDB Data Team • 08/09/2026
The InfiniteWP Client WordPress plugin vulnerability represents a critical security flaw that exploits improper authentication mechanisms within WordPress Multisite environments. This weakness affects versions prior to 1136 and stems from inadequate verification of site connection states and request authenticity at the remote management endpoint. The vulnerability specifically targets the plugin's handling of cryptographic key binding processes, creating an attack surface where unauthorized actors can manipulate session management protocols without proper authentication credentials.
The technical implementation flaw resides in the plugin's failure to validate the legitimacy of connection requests and verify that management operations originate from authorized sources. In WordPress Multisite installations, this oversight allows attackers to exploit the endpoint by establishing their own cryptographic keys and subsequently hijacking active administrator sessions. The vulnerability operates through a session manipulation attack vector where malicious actors can replace legitimate session tokens with their own, effectively gaining unauthorized administrative access to the entire network rather than individual sites within the multisite configuration.
The operational impact of this vulnerability extends far beyond simple privilege escalation, as it enables complete network compromise within WordPress Multisite environments. Once an attacker successfully hijacks a session and binds their key, they gain the ability to execute arbitrary code on the affected WordPress installation, potentially leading to data exfiltration, malicious payload deployment, and further lateral movement within the compromised infrastructure. This vulnerability directly violates security principles defined in cwe 306, which addresses missing authentication checks, and aligns with attack patterns described in the attack tree framework under credential compromise and session hijacking techniques.
Mitigation strategies should prioritize immediate plugin updates to version 1136 or later, which contain proper authentication verification mechanisms. Organizations must also implement network-level monitoring to detect unusual traffic patterns targeting the plugin's remote management endpoints, as well as conduct thorough audit reviews of active sessions and key bindings within their WordPress installations. Security controls should include implementing additional authentication layers such as two-factor authentication for administrative access and regular security scanning of WordPress plugins to identify similar vulnerabilities that may exist in other third-party components within the same environment.