External risk intelligence

Tassos Framework Plugin Arbitrary File Deletion Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.3)

CVE-2026-48906

The vulnerability affects plugins for Joomla, a content management system. These extensions are designed to be deployed as part of public-facing websites to handle forms, data, and site functionality. Because they are integrated into the web-accessible layer of a CMS, they are commonly exposed to the internet as part of the standard website infrastructure.

Tassos Advanced Custom Fields

1.0.0 to 2.8.123.0.0 to 3.1.31.0.0 to 4.4.125.0.0 to 5.1.51.0.0 to 6.3.117.0.0 to 7.1.11.0.0 to 5.6.116.0.0 to 6.1.91.0.0 to 5.0.55.1.0 to 5.2.01.0.0 to 1.2.62.0.0 to 2.1.01...

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This advisory details a critical vulnerability within the Tassos Framework Plugin that could allow unauthorized users to delete any files on an affected website. This issue impacts a widely used Joomla framework and related plugins, posing a significant risk to data integrity and site operability if exploited.

Users can delete arbitrary files.
Impacts widely used Joomla plugins.
Confirm relevance and exposure.

Attack Path

How an attacker could exploit the issue

An attacker could reach the Tassos Framework Plugin through the network without any prior access or user interaction. This allows them to trigger a vulnerability that lets them delete any file on the affected websites. The consequence of this is severe, potentially leading to the complete compromise or disruption of the site.

No authentication or user interaction needed.
Triggered by using the plugin's functionality.
Allows arbitrary file deletion on the site.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow unauthorized deletion of arbitrary files on affected Joomla sites. Supported conditions for this risk include when the Tassos Framework Plugin is installed and vulnerable.

Arbitrary file deletion on the site.
Unauthenticated users could delete files.
Potential site instability or data loss.

Operational Fix

Recommended remediation, mitigation, and detection steps

The Tassos Framework Plugin's arbitrary file deletion vulnerability likely affects website owners and administrators, as these plugins are integrated into public-facing Joomla sites. The first practical step is to inventory all Tassos plugins across your Joomla installations, identify their business criticality, and determine which are exposed externally or accessible to unauthorized users. Once identified, you can prioritize remediation by accountable teams.

Website owners/administrators should own the issue.
Verify Tassos plugin installations and exposure.
Plan remediation based on identified risk.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is the Tassos Framework Plugin used for?

The Tassos Framework is a foundational component used to power various extensions for Joomla, a popular content management system. These extensions, such as Convert Forms, EngageBox, and Google Structured Data, help site administrators manage forms, marketing tools, and SEO metadata. Because these plugins rely on the Tassos Framework to provide their core functionality, they are often installed together on Joomla websites to enhance site operations and user engagement.

What does CVE-2026-48906 mean for my files?

This vulnerability is classified under CWE-284, which relates to improper access control. In practical terms, it allows an unauthorized party to bypass security checks and issue commands to delete arbitrary files from your website's server. Because the flaw exists within the plugin's code, it creates a path for unintended file removal, which can lead to site instability, data loss, or the deletion of critical system files necessary for your website to function correctly.

How is the arbitrary file deletion triggered?

The vulnerability is triggered by interacting with the affected Tassos plugin over a network. An attacker does not need to have a pre-existing account on your site or trick a user into performing an action to succeed. Simply sending specifically crafted requests to the plugin's exposed functionality is sufficient to initiate the deletion process. If the plugin is not installed or the specific vulnerable version is not present, this trigger path does not exist.

Why is this CVE considered an external risk?

According to Halo Surface Signal, this vulnerability is considered an external risk because the affected plugins are designed to support public-facing websites. Since they are integrated directly into the web-accessible layer of your Joomla installation to manage forms or data, they are inherently reachable via the internet. This configuration means that your site can be accessed by unauthorized users globally, making them capable of reaching the vulnerable plugin code without needing internal access.

What should I do if I use Tassos plugins?

Your first step is to perform a comprehensive inventory of your Joomla environment to identify every instance where Tassos Framework or its related plugins are installed. Once identified, evaluate which sites are accessible via the internet and determine their overall business criticality. Use this information to coordinate with your technical team to prioritize these assets for remediation, ensuring that vulnerable software is updated or secured to prevent unauthorized file deletion.

References

tassos.gr/

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.