CVE-2025-69301: 
WordPress vulnerability analysis and mitigation

CVE-2025-69301 is a PHP Object Injection vulnerability (Deserialization of Untrusted Data) in the ThemeGoods PhotoMe WordPress theme, affecting all versions through 5.6.11. It was reported by researcher João Pedro S Alcântara (Kinorth) on November 18, 2025, and published by Patchstack on January 27, 2026, with NVD publication on February 20, 2026. The vulnerability carries a CVSS v3.1 base score of 9.8 (Critical), requiring no authentication, no user interaction, and exploitable remotely with low complexity (Patchstack, Feedly).

The root cause is improper deserialization of untrusted user-supplied data (CWE-502) within the PhotoMe WordPress theme, enabling PHP Object Injection (CAPEC-586). An unauthenticated remote attacker can send a crafted network request containing a malicious serialized PHP object, which the theme deserializes without adequate validation. If a suitable PHP Object Property (POP) chain exists within the WordPress installation or its plugins, this can be leveraged to achieve remote code execution, SQL injection, path traversal, or denial of service (Patchstack, Feedly).

Successful exploitation grants an attacker full confidentiality, integrity, and availability impact on the affected WordPress site. Depending on available POP chains, an attacker could achieve remote code execution, exfiltrate sensitive data, modify or delete site content, inject malicious code, or take the site offline entirely. The unauthenticated nature of the attack makes it suitable for mass-exploitation campaigns targeting thousands of WordPress sites regardless of their traffic or popularity (Patchstack).

As of the time of reporting, no public proof-of-concept exploit code has been identified, and there is no confirmed evidence of in-the-wild exploitation (Feedly). The EPSS score is approximately 0.024%, reflecting a currently low but non-negligible probability of exploitation. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. However, Patchstack classifies it as high priority and notes that vulnerabilities of this type are frequently used in mass-exploit campaigns against WordPress sites (Patchstack).

1. Reconnaissance: Identify WordPress sites using the PhotoMe theme (version ≤ 5.6.11) via web crawlers, Shodan, or WordPress-specific fingerprinting tools (e.g., WPScan).
2. Identify deserialization endpoint: Locate the vulnerable parameter or endpoint within the PhotoMe theme that accepts and deserializes user-supplied PHP data without sanitization.
3. Enumerate POP chains: Analyze the target WordPress installation and its installed plugins/themes for available PHP Object Property (POP) chains that can be abused post-deserialization (e.g., using tools like PHPGGC to generate gadget chains).
4. Craft malicious payload: Serialize a malicious PHP object leveraging an identified POP chain to achieve the desired outcome (e.g., remote code execution, file write, SQL injection).
5. Deliver payload: Submit the crafted serialized object to the vulnerable endpoint via an unauthenticated HTTP request.
6. Achieve objective: The server deserializes the object, triggering the POP chain and executing the attacker's intended action (e.g., webshell upload, data exfiltration, or site defacement) (Patchstack).

• Network: Unusual or malformed HTTP POST/GET requests to PhotoMe theme endpoints containing serialized PHP data (e.g., O: patterns in request bodies or parameters); unexpected outbound connections from the web server to external IPs.
• File System: Newly created or modified PHP files in the WordPress theme or uploads directory (potential webshells); unexpected changes to wp-config.php or core WordPress files.
• Logs: Web server access logs showing requests with serialized PHP object patterns (O:[0-9]+:) targeting PhotoMe theme files; PHP error logs referencing deserialization or object instantiation errors.
• Process: Unusual child processes spawned by the web server process (e.g., bash, curl, wget, python) indicating post-exploitation activity.

As of the disclosure date, no official patch from ThemeGoods is available for PhotoMe versions through 5.6.11 (Patchstack). Site owners should immediately check for an updated version of the theme and upgrade if one becomes available. In the interim, Patchstack has issued a virtual patch/mitigation rule to block exploitation attempts for Patchstack-protected sites. Additional workarounds include implementing network-level access controls to restrict exposure, applying a web application firewall (WAF) rule to block serialized PHP object patterns in requests, and monitoring for suspicious deserialization activity (Feedly).

Patchstack, which coordinated the disclosure, classified the vulnerability as high priority and noted its potential for use in mass-exploit campaigns against WordPress sites. The vulnerability was included in Wordfence's weekly WordPress vulnerability report for the period of January 26 – February 1, 2026, indicating broad awareness within the WordPress security community (Wordfence). No significant vendor statements from ThemeGoods or notable social media discussions have been identified beyond these security community reports.