CVE-2026-11913

Executive Summary

CVE-2026-11913 is a vulnerability reported in the Drupal "Mother May I" module. The official description is minimal, stating only that a vulnerability exists in the module affecting all versions (*.*). No CVSS score, CWE classification, or detailed technical description has been provided by the NVD. The EPSS score is 0.0%, indicating no observed exploitation activity in the wild at the time of analysis. No public proof-of-concept (PoC) code, exploit database entries, or GitHub advisory context are available. This report provides a comprehensive analysis based on the limited available data, focusing on detection, potential exploitation scenarios, and remediation strategies for Drupal administrators.

Supply Chain & Package Security

This vulnerability affects a Drupal module ("Mother May I"), which is part of the Drupal ecosystem. Drupal modules are distributed via the official Drupal.org project page and can be managed through Composer. The lack of a specific version range or patch status increases supply chain risk, as administrators may be unaware of the vulnerability's scope. It is critical to monitor the Drupal security advisory page for updates and to verify the integrity of module downloads using checksums provided by Drupal.org.

CVSS Breakdown & Threat Level

CVSS Score: 0.0 (Unassigned) CVSS Vector: UNKNOWN

The CVSS score is currently unassigned, indicating that the vulnerability has not been fully analyzed or scored by NVD. Without a vector string, the attack vector, complexity, privileges required, user interaction, scope, and impact (confidentiality, integrity, availability) remain unknown. The threat level is Unknown but should be treated as High until more information is available, given the potential for a Drupal module vulnerability to affect a large number of sites.

Deep Dive & Mechanics

Due to the lack of technical details, the exact mechanics of CVE-2026-11913 are unknown. However, based on common vulnerability patterns in Drupal modules, the following are plausible scenarios:

• SQL Injection (CWE-89): The module may fail to sanitize user input used in database queries, allowing an attacker to execute arbitrary SQL commands.
• Cross-Site Scripting (XSS) (CWE-79): The module may improperly handle user-supplied data in output, allowing injection of malicious scripts.
• Authentication Bypass (CWE-287): The module may have flaws in permission checks, allowing unauthorized access to restricted functionality.
• Remote Code Execution (RCE) (CWE-94): The module may allow deserialization of untrusted data or execution of arbitrary PHP code.

The "Mother May I" module name suggests it may be related to permission or access control features, making authentication bypass or privilege escalation likely.

Vulnerable vs. Patched Code

No patched code is available. The following is a hypothetical example of a vulnerable vs. patched code pattern for a common Drupal module vulnerability (SQL injection):

Vulnerable Code (hypothetical):

function mother_may_i_get_data($uid) {
  $query = db_query("SELECT * FROM {mother_may_i_permissions} WHERE uid = $uid");
  return $query->fetchAll();
}

Patched Code (hypothetical):

function mother_may_i_get_data($uid) {
  $query = db_query("SELECT * FROM {mother_may_i_permissions} WHERE uid = :uid", array(':uid' => $uid));
  return $query->fetchAll();
}

The patched version uses parameterized queries to prevent SQL injection.

Exploitation & Lab Setup

Red Team

Since no public exploit exists, a red team would need to perform manual analysis. A typical approach for a Drupal module vulnerability includes:

1. Reconnaissance: Identify the target Drupal site and confirm the "Mother May I" module is enabled (e.g., via HTTP headers, page source, or /admin/modules if accessible).
2. Fuzzing: Use tools like Burp Suite or custom scripts to fuzz input parameters (GET/POST) handled by the module.
3. Static Analysis: Download the module source code from Drupal.org and search for common vulnerability patterns (e.g., db_query with concatenation, t() without proper escaping, drupal_http_request without validation).
4. Exploit Development: Craft a payload based on the identified vulnerability (e.g., SQL injection payload: ' OR 1=1 --).

Example SQL injection payload (hypothetical):

' UNION SELECT * FROM users; --

Blue Team

1. Isolate the Module: Immediately disable the "Mother May I" module if it is not critical for operations.
2. Monitor Logs: Enable Drupal's database logging (watchdog) and review for unusual SQL errors or suspicious requests.
3. Web Application Firewall (WAF): Deploy or update WAF rules to block common injection patterns (SQLi, XSS).
4. Harden Input Validation: Ensure all user input is validated and sanitized at the application layer.

Indicators of Compromise (IOCs)

• File Hashes (SHA256): Unknown (no module version specified)
• Network Indicators:
  • Suspicious GET/POST requests to paths like /mother-may-i/* with SQL-like characters (', --, UNION).
  • Unusual database error messages in HTTP responses.
• Log Entries:
  • Drupal watchdog logs containing SQL syntax errors.
  • PHP error logs with PDOException or DatabaseStatementBase errors.
• System Indicators:
  • Unexpected files in the Drupal sites/default/files directory.
  • New or modified user accounts with elevated privileges.

Detection Engineering

YARA Rule

rule CVE_2026_11913_Mother_May_I_SQLi {
  meta:
    description = "Detects potential SQL injection attempts targeting Drupal Mother May I module"
    author = "Valters IT"
    date = "2025-04-10"
    hash = "unknown"
  strings:
    $sqli1 = "UNION SELECT" nocase
    $sqli2 = "OR 1=1" nocase
    $sqli3 = "' --" nocase
    $module_path = "/mother-may-i/" nocase
  condition:
    any of ($sqli*) and $module_path
}

Sigma Rule

title: Drupal Mother May I Module SQL Injection Attempt
id: 8a4b3c2d-1e5f-6a7b-8c9d-0e1f2a3b4c5d
status: experimental
description: Detects SQL injection patterns in requests to the Drupal Mother May I module
author: Valters IT
date: 2025/04/10
logsource:
  category: webserver
  product: apache
detection:
  selection:
    cs-method: 'GET'
    cs-uri-query|contains:
      - 'UNION SELECT'
      - 'OR 1=1'
      - "' --"
    cs-uri-stem|contains: '/mother-may-i/'
  condition: selection
falsepositives:
  - Legitimate use of SQL keywords in non-malicious context (unlikely)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2026-11913 Drupal Mother May I SQL Injection Attempt"; flow:to_server,established; content:"/mother-may-i/"; http_uri; pcre:"/(UNION\s+SELECT|OR\s+1=1|'\s*--)/i"; classtype:web-application-attack; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate Action: Disable the "Mother May I" module until a patch is released and verified.
2. Monitor Drupal Security Advisories: Regularly check Drupal.org security advisories for updates.
3. Apply Patches: Once a patched version is released, update the module immediately.
4. General Hardening:
   • Keep Drupal core and all modules up to date.
   • Use a Web Application Firewall (WAF) with rules for common web attacks.
   • Implement the principle of least privilege for database users.
   • Regularly audit module permissions and configurations.
5. Incident Response: If exploitation is suspected, follow your organization's incident response plan, including forensic analysis of logs and system files.

Valters IT
DevSecOps & Cyber Threat Intelligence