CVE-2026-57738 in 777 Plugin
Summary
by MITRE • 07/13/2026
Deserialization of Untrusted Data vulnerability in axiomthemes 777 triple-seven allows Object Injection.This issue affects 777: from n/a through <= 1.13.0.
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Analysis
by VulDB Data Team • 07/13/2026
The deserialization of untrusted data vulnerability in axiomthemes 777 triple-seven represents a critical security flaw that enables object injection attacks through improper input validation mechanisms. This vulnerability resides within the theme's handling of serialized data structures, creating an attack surface where maliciously crafted objects can be injected and executed within the target system. The issue specifically affects versions ranging from n/a through version 1.13.0, indicating a prolonged period during which this weakness remained unaddressed. The vulnerability stems from insufficient sanitization of user-supplied data that is subsequently processed through PHP's unserialize function or similar deserialization mechanisms, allowing attackers to craft malicious payloads that exploit the underlying object instantiation process.
The technical exploitation of this vulnerability operates through the manipulation of serialized data structures that are meant to represent objects within the WordPress environment. When an attacker can influence the input passed to a deserialization function, they can inject malicious objects that execute arbitrary code upon instantiation. This typically involves crafting serialized PHP objects with specially designed payloads that leverage the __wakeup or __destruct magic methods to perform unauthorized operations. The attack vector becomes particularly dangerous in themes and plugins where user input is processed without proper validation, as demonstrated by the triple-seven theme's implementation. The vulnerability aligns with CWE-502 which specifically addresses deserialization of untrusted data and represents a well-documented pattern of insecure deserialization practices that have been exploited across numerous web applications.
The operational impact of this vulnerability extends beyond simple code execution to encompass complete system compromise, data exfiltration, and potential persistence mechanisms within the affected WordPress installation. Attackers can leverage this weakness to escalate privileges, install backdoors, modify or delete content, and establish persistent access points within the compromised environment. The attack surface is further expanded when considering that WordPress themes often have elevated permissions and direct access to database operations, making successful exploitation particularly damaging for website owners. This vulnerability also enables attackers to potentially pivot to other systems within the network if the compromised WordPress installation shares resources with other services, creating cascading security implications throughout the infrastructure.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term architectural improvements in input validation and data handling practices. The primary solution involves updating the affected theme to a version that properly validates and sanitizes all user-supplied data before deserialization occurs, with version 1.13.1 or later typically providing the necessary fixes. Organizations should implement strict input validation controls that reject serialized data from untrusted sources and employ alternative data exchange formats such as json_encode/json_decode rather than PHP's native serialization mechanisms when possible. Security measures should include disabling unnecessary deserialization functions, implementing proper access controls for theme modification, and establishing monitoring systems to detect anomalous behavior patterns that may indicate exploitation attempts. This vulnerability demonstrates the importance of following secure coding practices and adheres to ATT&CK technique T1548.003 which covers abuse of update mechanism and privilege escalation through compromised software components.
The broader implications of this vulnerability highlight the critical need for comprehensive security testing throughout the software development lifecycle, particularly in third-party themes and plugins that often receive less rigorous security scrutiny than core platform components. Regular security audits should focus on identifying serialization functions and input handling mechanisms that could be exploited through similar attack vectors. Organizations must also maintain up-to-date security practices including automated vulnerability scanning, dependency monitoring, and immediate patch deployment when security advisories are published for known vulnerabilities. The incident underscores the necessity of implementing defense-in-depth strategies that include network segmentation, application firewalls, and continuous monitoring to detect and prevent exploitation attempts before they can cause significant damage to the operational environment.