External risk intelligence

Drupal Mother May I Vulnerability Allows System Compromise

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-11913

The vulnerability affects a Drupal module. Drupal is a content management system typically deployed as a public-facing web application, making its modules and extensions highly likely to be reachable via the internet as part of the standard web server surface.

Cross-site Scripting

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

A critical vulnerability has been identified in a Drupal module called "Mother May I." This issue has the potential for significant impact due to its critical severity, and organizations using this module should confirm their exposure.

Module allows unauthorized access.
Critical flaw impacts public-facing sites.
Confirm relevance and exposure to Drupal.

Attack Path

How an attacker could exploit the issue

A remote attacker could exploit this vulnerability by sending a crafted request to a Drupal site that uses the affected module. This could allow them to execute arbitrary code or gain unauthorized access to sensitive information, potentially leading to a complete system compromise.

No authentication required.
Triggered via network requests.
Leads to code execution and data compromise.

Live Threat

Current exploitation, exposure, and threat context

While specific details regarding the data affected or exploitation methods are not yet available, this vulnerability in the Drupal Mother May I module could potentially impact system integrity and lead to unauthorized information exposure. The module is currently unsupported, meaning there are no official fixes or patches available.

System data and service behavior.
Information disclosure via unsupported module.
Unauthorized access and service disruption.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability in a Drupal module requires immediate attention from teams managing web applications and infrastructure. The first step is to identify all instances of the affected Drupal module, determine their reachability and criticality, and then assign ownership for remediation planning.

Identify the module owner and application context.
Verify exposure and business criticality of instances.
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 Drupal Mother May I module?

Mother May I is a software module designed for Drupal, a popular open-source content management system. Drupal modules are add-on components that extend the core functionality of a website, enabling specific features such as custom permissions, data processing, or enhanced user interaction. This module serves as an integrated part of a Drupal-based web architecture.

What is the vulnerability class for CVE-2026-11913?

This vulnerability is classified as CWE-79, commonly known as Cross-Site Scripting (XSS). In the context of this CVE, it represents a weakness where the module fails to properly sanitize input, potentially allowing an attacker to inject and execute malicious scripts. This flaw can lead to unauthorized access or the compromise of data handled by the Drupal site.

How is this vulnerability triggered?

An attacker triggers this flaw by sending a specifically crafted network request to a Drupal site that has the Mother May I module installed. Because the vulnerability does not require any user authentication, the malicious request can be executed by anyone with network access to the application. It is not triggered by internal administrative actions or local file access.

Why should I care if my Drupal site is public-facing?

According to Halo Surface Signal, this vulnerability is significant because the Mother May I module is typically used in public-facing web applications. Since these sites are designed to be reachable via the internet, they are naturally exposed to remote network requests. This increased accessibility makes it easier for an attacker to target the vulnerability without needing prior internal access to your network.

What is the first step to address CVE-2026-11913?

Start by auditing your Drupal environments to identify every instance where the Mother May I module is currently installed. Once located, evaluate the business criticality of those specific sites to understand the potential impact of a compromise. Since the module is currently unsupported, coordinate with your technical team to prioritize removing the module or restricting access to the affected web services.

References

www.drupal.org/sa-contrib-2026-045

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.