CVE-2025-68903: 
WordPress vulnerability analysis and mitigation

CVE-2025-68903 is a PHP Object Injection vulnerability caused by deserialization of untrusted data in the AivahThemes Anona WordPress theme. It affects all versions of the Anona theme through version 8.0 and was reported by researcher Tran Nguyen Bao Khanh (VCI - VNPT Cyber Immunity) on September 11, 2025, with public disclosure on January 13–22, 2026. As of the time of reporting, no official patch is available from the vendor. The vulnerability carries a CVSS v3.1 base score of 8.8 (High), assigned by CISA-ADP (Patchstack, NVD).

The vulnerability is classified under CWE-502 (Deserialization of Untrusted Data) and maps to CAPEC-586 (Object Injection). The Anona theme fails to properly validate or sanitize serialized PHP data before deserializing it, allowing an authenticated attacker with low privileges (e.g., Subscriber role) to pass malicious serialized objects to the application. If a suitable PHP Object/POP (Property-Oriented Programming) 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 can result in complete compromise of the affected WordPress site, with high impact to confidentiality, integrity, and availability. An authenticated attacker could execute arbitrary code, access or exfiltrate sensitive data, modify site content or configurations, and potentially disrupt site availability. The presence of a suitable POP chain in the environment further amplifies the risk, potentially enabling lateral movement within the hosting infrastructure (Patchstack).

No public proof-of-concept exploit code has been identified, and there is no confirmed evidence of in-the-wild exploitation at this time. The vulnerability requires low-privilege authentication (Subscriber level), making it accessible to a broad range of potential attackers on sites with open user registration. The EPSS score is approximately 0.024%, indicating a currently low probability of exploitation in the near term. The CVE is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. Patchstack notes that vulnerabilities of this class are frequently used in mass-exploit campaigns once weaponized (Patchstack).

1. Reconnaissance: Identify WordPress sites using the Anona theme (version ≤ 8.0) via passive fingerprinting tools (e.g., WPScan, Shodan) or by inspecting theme metadata in page source.
2. Obtain low-privilege access: Register or log in as a low-privilege user (e.g., Subscriber) on the target WordPress site, if user registration is enabled.
3. Identify the vulnerable input: Locate the theme functionality that accepts and deserializes PHP-serialized data from user-controlled input.
4. Craft a malicious payload: Construct a serialized PHP object payload that leverages an available POP chain within the WordPress installation (e.g., from installed plugins or WordPress core classes) to achieve the desired effect (RCE, file write, etc.).
5. Submit the payload: Send the crafted serialized object to the vulnerable endpoint via an authenticated HTTP request.
6. Achieve objective: If a valid POP chain is present, the deserialized object triggers the chain, resulting in arbitrary code execution, data exfiltration, or other malicious outcomes (Patchstack).

• Network: Unusual authenticated POST requests to WordPress endpoints associated with the Anona theme containing serialized PHP data (e.g., strings beginning with O: or a: in request bodies or parameters).
• Logs: WordPress or web server access logs showing repeated requests from low-privilege accounts to theme-specific endpoints; PHP error logs referencing unexpected class instantiation or deserialization errors.
• File System: Unexpected new PHP files (web shells) in the WordPress theme or uploads directory; modifications to existing theme files with injected code.
• Process: Unusual child processes spawned by the web server process (e.g., bash, curl, wget) indicating potential code execution following deserialization.

No official patch from AivahThemes is available for the Anona theme as of the disclosure date. Site administrators should consider disabling or replacing the Anona theme until a patched version is released. Access to theme functionality should be restricted to trusted administrators, and open user registration should be disabled if not required. Patchstack has issued a virtual patch (mitigation rule) for subscribers of its service to block exploitation attempts. Monitoring for suspicious deserialization activity and object instantiation is also recommended (Patchstack).

Wordfence included this vulnerability in its weekly WordPress vulnerability report for the week of January 12–18, 2026, highlighting it as part of broader WordPress ecosystem security coverage. Patchstack, which discovered and disclosed the vulnerability, issued a virtual patch for its users given the absence of an official fix. No significant broader media coverage or notable researcher commentary beyond these sources has been identified.