CVE-2026-29001 in TastyIgniter
Summary
by MITRE • 10/23/2026
TastyIgniter through 4.4.5 contain a PHP object injection vulnerability that allows authenticated administrators to achieve arbitrary code execution by submitting a serialized PHP object as a settings value, which is stored unsanitized and later unserialized by getValueAttribute() when the setting is read. Attackers can submit a serialized gadget chain, such as one generated via phpggc, through the admin settings form (for example the maintenance_message setting loaded by CheckMaintenance.php) to achieve arbitrary operating-system command execution as the PHP application process user, with the impact persisting until the value is overwritten.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 10/23/2026
The vulnerability identified in TastyIgniter versions up to 4.4.5 represents a critical server-side weakness rooted in improper handling of serialized data within administrative configuration settings. This flaw specifically manifests as an unserialization issue, where user-supplied input containing PHP objects is processed without adequate validation or sanitization prior to deserialization. The attack vector requires the adversary to possess authenticated administrator privileges, which allows them access to the application's administrative interface and its associated settings management forms. By targeting specific configuration fields such as maintenance_message, an attacker can inject a maliciously crafted serialized payload that exploits internal PHP object properties and methods known as gadgets. These gadgets form a chain of execution when deserialized, ultimately leading to remote code execution on the underlying server infrastructure running the TastyIgniter application.
From a technical perspective, the core mechanism of exploitation lies in the getValueAttribute() method which retrieves setting values from storage. When this function processes data retrieved for settings like maintenance_message via CheckMaintenance.php it invokes PHP's unserialize function on content that has been stored directly from user input without filtering dangerous classes or methods. This lack of validation permits an attacker to craft a serialized object graph using tools such as phpggc which generates exploit payloads based on known vulnerable libraries within the PHP ecosystem including common frameworks like Laravel Symfony and WordPress plugins depending on dependencies used by TastyIgniter. Upon deserialization these objects trigger side effects that allow arbitrary command execution under the context of the web server process typically www-data or apache thereby granting full control over the application environment.
The operational impact of this vulnerability is severe as it effectively compromises the confidentiality integrity and availability of the entire system hosting the vulnerable instance. An authenticated attacker can execute operating-system commands with the privileges assigned to the PHP runtime user which often includes read access to sensitive configuration files database credentials source code and potentially write capabilities depending on file permissions configured in production environments. This level of compromise enables further lateral movement within internal networks if the server is accessible from other segments or allows for persistence mechanisms such as backdoor installation cron job modification or web shell deployment that remain active until manually removed by system administrators who may not be aware of the initial entry point due to its stealthy nature through legitimate administrative interfaces.
This vulnerability aligns with CWE-502 Deserialization of Untrusted Data which highlights risks associated with processing externally influenced serialized structures without proper integrity checks or type restrictions. Additionally it maps to MITRE ATT&CK technique T1059 Command and Scripting Interpreter where adversaries utilize built-in system utilities for execution purposes after gaining initial access through privilege escalation via the admin panel. The persistence aspect noted in reports indicates that once executed malicious code remains effective until explicit remediation occurs emphasizing the importance of timely patching procedures within enterprise security operations centers responsible for monitoring web application platforms like TastyIgniter used extensively by restaurant businesses worldwide managing online ordering systems and delivery logistics digitally.
Mitigation strategies must prioritize immediate upgrading to patched versions released after version 4.4.5 where developers have addressed this deserialization flaw through stricter input validation mechanisms or replacement of unsafe unserialization practices with safer alternatives such as JSON parsing for structured data exchange instead relying on native PHP object serialization which inherently carries higher risk profiles due its complexity and potential exposure to gadget chains present in widely used third-party libraries integrated into modern web frameworks. Administrators unable to upgrade immediately should restrict administrative access strictly via IP whitelisting enforce multi-factor authentication protocols review logs regularly for anomalous activity patterns indicative of exploitation attempts isolate affected instances from network segments containing critical assets until permanent fixes are deployed ensuring minimal exposure window during transition periods while maintaining service continuity through careful change management processes aligned with industry best practices outlined by NIST SP 800-53 regarding configuration management and vulnerability remediation timelines.