CVE-2026-74253
Received Received - Intake

Unauthenticated Remote Code Execution in Regular Labs Sourcerer Joomla Extension

Publication date: 2026-08-17

Last updated on: 2026-08-17

Assigner: Joomla! Project

Description
Joomla Extension - regularlabs.com - Unauthenticated RCE through unverified reflected user input in Sourcerer < 14.0.0 - Regular Labs Sourcerer before 14.0.0 processes {source} blocks found in Joomla’s final rendered HTML without reliably determining where that code originated.

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Meta Information

Published
2026-08-17
Last Modified
2026-08-17
Generated
2026-08-17
AI Q&A
2026-08-17
EPSS Evaluated
N/A
NVD
CVE-2026-74253
EUVD
EUVD-2026-60307

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
regular_labs sourcerer to 14.0.0 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-94 The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.

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Executive Summary

This is a critical Remote Code Execution (RCE) vulnerability in Regular Labs Sourcerer Joomla extension versions before 14.0.0. It allows unauthenticated attackers to execute arbitrary code by injecting malicious code into {source} blocks that get processed during HTML rendering without proper validation of the code origin.

Detection Guidance

Check Joomla extensions for Regular Labs Sourcerer versions below 14.0.0. Inspect rendered HTML for suspicious {source} blocks containing executable code. Monitor network traffic for unexpected outbound connections from Joomla servers.

Impact Analysis

An attacker could exploit this to take full control of your Joomla website, steal sensitive data, install malware, deface the site, or use it as a pivot point to attack other systems. Since it requires no authentication, any unpatched website is at immediate risk.

Compliance Impact

This vulnerability could lead to unauthorized data access or exfiltration, violating GDPR's integrity and confidentiality principles or HIPAA's security rule. Organizations may face regulatory fines, legal liabilities, and reputational damage if exploited.

Mitigation Strategies

Update Regular Labs Sourcerer to version 14.0.0 or higher immediately. Disable or remove the vulnerable extension if updating is not possible. Review and restrict file permissions on Joomla directories to prevent unauthorized code execution.

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