CVE-2026-57770 in Grand Photography Plugin
Summary
by MITRE • 07/13/2026
Deserialization of Untrusted Data vulnerability in ThemeGoods Grand Photography grandphotography allows Object Injection.This issue affects Grand Photography: from n/a through <= 5.7.8.
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Analysis
by VulDB Data Team • 07/13/2026
This vulnerability represents a critical deserialization flaw in the ThemeGoods Grand Photography WordPress theme that enables remote code execution through object injection attacks. The issue stems from the theme's improper handling of untrusted data during the deserialization process, creating a pathway for malicious actors to inject arbitrary objects into the application's memory space. This weakness allows attackers to execute arbitrary code on the target system with the privileges of the web server, potentially leading to complete compromise of the affected WordPress installation.
The technical flaw manifests when the theme processes user-supplied data without adequate validation or sanitization before deserializing it into PHP objects. Attackers can craft malicious serialized data that, when processed by the vulnerable theme, triggers the execution of unintended code. This type of vulnerability falls under CWE-502, which specifically addresses deserialization of untrusted data, and aligns with ATT&CK technique T1548.003 for bypassing system permissions through code injection. The vulnerability affects all versions from the initial release up to and including version 5.7.8, indicating a long-standing security gap that has not been properly addressed.
The operational impact of this vulnerability extends beyond simple data compromise, as it provides attackers with persistent access to the target environment. Once exploited, malicious actors can establish backdoors, exfiltrate sensitive data, modify content, or use the compromised system as a staging point for further attacks within the network infrastructure. The vulnerability's severity is amplified by the widespread adoption of WordPress themes and the ease with which attackers can exploit such deserialization flaws through automated scanning tools. Organizations running affected versions face significant risk of unauthorized access, data breaches, and potential regulatory violations due to inadequate security controls.
Mitigation strategies should prioritize immediate patching to version 5.7.9 or later, as this addresses the core deserialization vulnerability through proper input validation and sanitization. Additionally, implementing web application firewalls with rules specifically targeting malicious serialized data patterns can provide defensive measures while patches are deployed. Security configurations should include disabling unnecessary PHP functions that could aid exploitation, such as eval(), system(), or shell_exec(). Regular security audits and penetration testing should verify the effectiveness of implemented controls, while monitoring systems should be configured to detect unusual deserialization activities. Organizations should also consider implementing principle of least privilege access controls and regular automated vulnerability scanning to identify similar weaknesses in other components of their WordPress infrastructure.