CVE-2026-0677: 
WordPress vulnerability analysis and mitigation

CVE-2026-0677 is a PHP Object Injection vulnerability (Deserialization of Untrusted Data) in the TotalContest Lite WordPress plugin by TotalSuite, affecting all versions up to and including 2.9.1. The vulnerability was reported by researcher 'hhhai' on December 9, 2025, and published by Patchstack on March 10, 2026. It carries a CVSS v3.1 base score of 7.2 (High), requiring high privileges (Author/Developer level) for exploitation (Patchstack, Red Hat CVE).

The vulnerability is classified as CWE-502 (Deserialization of Untrusted Data) and maps to CAPEC-586 (Object Injection). The plugin fails to safely handle user-supplied serialized data, allowing an authenticated attacker with Author or Developer-level privileges to inject a malicious PHP object. If a suitable Property-Oriented Programming (POP) chain exists within the WordPress environment, this can be leveraged to achieve code injection, SQL injection, path traversal, or denial of service (Patchstack).

Successful exploitation could allow an authenticated attacker to execute arbitrary code, perform SQL injection, traverse file paths, or cause denial of service on the affected WordPress installation, depending on the availability of a suitable POP chain in the environment. The impact spans confidentiality, integrity, and availability — all rated High in the CVSS scoring. While exploitation requires high privileges, a compromised or malicious contributor/author account could be sufficient to trigger the vulnerability (Patchstack, Red Hat CVE).

As of the time of publication, no official patch is listed as available, and Patchstack rates the exploitation priority as Low, noting the vulnerability is unlikely to be actively exploited in the near term. The EPSS score is approximately 0.044%, indicating a low probability of exploitation in the wild within the next 30 days. No evidence of in-the-wild exploitation, threat actor attribution, or CISA KEV catalog listing has been identified for this CVE (Patchstack).

1. Reconnaissance: Identify WordPress sites running TotalContest Lite plugin version 2.9.1 or earlier using tools like WPScan or by inspecting plugin metadata in publicly accessible readme files.
2. Obtain Privileged Access: Acquire or compromise an account with Author or Developer-level privileges on the target WordPress site (e.g., via credential stuffing, phishing, or brute force).
3. Identify Injection Point: Locate the plugin functionality that processes serialized PHP data without proper validation or sanitization.
4. Craft Malicious Payload: Construct a serialized PHP object payload that leverages an available POP chain within the WordPress core, plugins, or themes installed on the target site to achieve the desired effect (e.g., remote code execution, file write).
5. Submit Payload: Submit the crafted serialized payload through the vulnerable plugin input (e.g., a form field or API parameter processed by TotalContest Lite).
6. Trigger Deserialization: The server deserializes the malicious object, invoking magic methods (__wakeup, __destruct, etc.) in the POP chain, ultimately executing the attacker's intended action (Patchstack).

• Logs: WordPress access logs showing unusual POST requests to TotalContest Lite plugin endpoints from authenticated low-privilege accounts; PHP error logs containing unexpected object instantiation or magic method invocations.
• File System: Unexpected new PHP files or web shells in the WordPress uploads directory or plugin directories; modifications to existing plugin files.
• Database: Unusual entries in the WordPress database related to TotalContest Lite contest data containing serialized PHP strings with object references.
• Process: Unexpected child processes spawned by the web server process (e.g., bash, curl, wget) following plugin interaction.

Patchstack indicates no official patch was available at the time of initial disclosure; administrators should monitor the TotalContest Lite plugin page on WordPress.org for an updated version beyond 2.9.1. As an immediate workaround, consider deactivating and removing the TotalContest Lite plugin until a patched version is released. Restrict Author/Developer-level account access to trusted users only, and deploy a Web Application Firewall (WAF) or a virtual patching solution such as Patchstack to block exploitation attempts in the interim (Patchstack). The Feedly intelligence summary notes a patch is available in version 2.9.2 and later (Red Hat CVE).

The vulnerability was noted in the Wordfence Intelligence Weekly WordPress Vulnerability Report for the week of March 9–15, 2026, indicating routine tracking by the WordPress security community (Wordfence Blog). Patchstack, the assigning CNA, classified the issue as low priority with limited immediate exploitation risk, reflecting a measured community response. No significant social media controversy or major media coverage has been identified for this vulnerability.