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The CVE-2026-48906 vulnerability stems from improper access control (CWE‑284) within the Tassos Framework system plugin for Joomla. The core issue lies in how the plugin processes incoming AJAX requests through Joomla’s built-in `com_ajax` entry point. Specifically, the plugin fails to sufficiently validate or restrict the parameters of internal framework methods that can be triggered remotely. Under certain conditions, an unauthenticated attacker can invoke sensitive internal functions without the necessary permission checks. By manipulating the request, the attacker can target the plugin’s file handling capabilities, leading to the deletion of arbitrary files on the server. The flaw permits the deletion of any file the web server user has write access to, including critical configuration files (like configuration.php), core Joomla assets, extension files, and potentially log files. This can cause a complete denial of service, assist in privilege escalation, or be combined with other vulnerabilities to achieve remote code execution. The vulnerability affects all extensions that rely on the vulnerable framework, including Convert Forms, EngageBox, and others, impacting versions prior to the patched release. The attack is remotely executable, requires no authentication, and is considered easy to exploit, with a CVSS v4 base score of 9.3 (CRITICAL).
DailyCVE Form:
Platform: Joomla
Version: <6.1.0
Vulnerability: Arbitrary File Deletion
Severity: CRITICAL (9.3)
date: 2026-05-27
Prediction: 2026-05-28
What Undercode Say:
Check Tassos Framework plugin version from CLI (adjust path): php ./cli/joomla.php extension:info plg_system_nrframework | grep Version Manual check file path: grep "version" ./plugins/system/nrframework/nrframework.xml Check for vulnerable endpoint exposure: curl -k -X POST "https://example.com/index.php?option=com_ajax&format=raw" \ -d "plugin=nrframework&method=deleteFile&path=configuration.php" Inspect logs for suspicious com_ajax requests: grep "com_ajax" /var/log/apache2/access.log | grep -v "referer"
Exploit:
Send a crafted AJAX request to `index.php?option=com_ajax` with a `plugin` parameter pointing to the Tassos Framework (nrframework). The request includes a `method` and `path` parameter, allowing an unauthenticated attacker to call internal file-handling methods and delete any system file by specifying an absolute or relative path.
Protection:
Update Tassos Framework plugin to version 6.1.0 or higher. If immediate patching is not possible, disable the `plg_system_nrframework` plugin entirely or restrict direct access to `com_ajax` via web application firewall rules.
Impact:
Total loss of site availability, permanent data destruction, service disruption, and potential foothold for further compromise on the hosting server.
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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