CVE-2026-67283 in Cotton Cloud Extension
Summary
by MITRE • 08/12/2026
Joomla Extension - tabaoca.org - Improper ACL implementation allows file operations in Cotton Cloud < 2.0.2 - Unauthenticated users could perform various file-related operations (read, delete, overwrite, re-assign permissions) on every file managed within the extension.
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Analysis
by VulDB Data Team • 08/12/2026
This vulnerability resides within the Joomla extension ecosystem specifically affecting the tabaoca.org Cotton Cloud extension version prior to 2.0.2. The core issue manifests as an improper access control list implementation that fundamentally undermines the security model governing file operations within the extension. The flaw allows unauthenticated attackers to execute a wide range of file manipulation activities including reading, deleting, overwriting, and reassigning permissions on all files managed by the extension. This represents a critical breakdown in the principle of least privilege and demonstrates a severe misconfiguration in the extension's permission handling mechanisms.
The technical nature of this vulnerability aligns with CWE-284 which describes improper access control or inadequate access control implementation. The Cotton Cloud extension fails to properly validate user authentication status before executing file operations, creating an attack surface where any remote user can exploit these capabilities without requiring valid credentials. This misimplementation allows attackers to bypass normal authorization checks and directly interact with the file system through the extension's interface, effectively providing unrestricted access to all managed files.
From an operational perspective, this vulnerability poses significant risks to organizations using the affected Joomla extension. Unauthenticated users can potentially access sensitive data stored in the file management system, delete critical files, overwrite important content, or modify file permissions to gain persistent access to system resources. The impact extends beyond simple data exposure as attackers could use these capabilities to establish backdoors, deploy malicious payloads, or disrupt normal operations through file deletion or modification attacks that compromise system integrity and availability.
The security implications of this vulnerability extend to multiple ATT&CK techniques including T1078 for valid accounts usage, T1566 for phishing attacks that might be used to gain initial access, and T1486 for data encryption for ransom. Organizations should immediately implement mitigations including updating to Cotton Cloud version 2.0.2 or later, implementing network-based restrictions to limit access to the extension's endpoints, and conducting thorough audits of file system permissions within affected environments. Additionally, administrators should consider implementing web application firewalls to monitor and block suspicious file operation patterns while ensuring proper authentication mechanisms are enforced for all extension functionalities.
The vulnerability highlights critical security gaps in Joomla extension development practices where proper input validation and access control implementation are often overlooked during the development lifecycle. Organizations relying on third-party extensions must maintain rigorous security assessment procedures including dependency checks, regular updates, and continuous monitoring for known vulnerabilities. This incident underscores the importance of maintaining current security patches and implementing comprehensive security controls around web application interfaces that handle file operations to prevent unauthorized access and data compromise.