CVE-2026-9082: Drupal Core SQL Injection — CISA KEV Alert, Detection & Hardening

Introduction

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added a critical security flaw impacting Drupal Core to its Known Exploited Vulnerabilities (KEV) catalog. This designation follows concrete evidence of active exploitation in the wild.

The vulnerability, tracked as CVE-2026-9082, is an SQL Injection (SQLi) flaw affecting all supported versions of Drupal Core. While the CVSS score sits at 6.5 (Medium), the addition to the CISA KEV catalog elevates the priority for remediation to "Critical" for federal agencies and should trigger immediate emergency patching for all organizations. SQL injection flaws provide attackers with direct read/write access to the backend database, often leading to data exfiltration, authentication bypass, and in some cases, full server compromise.

Defenders must assume that active scanning and exploitation attempts are currently underway against unpatched Drupal instances.

Technical Analysis

• Affected Products: Drupal Core (All supported versions).
• CVE Identifier: CVE-2026-9082
• CVSS Score: 6.5 (Medium)
• Vulnerability Type: SQL Injection
• Exploitation Status: Confirmed Active Exploitation (Added to CISA KEV)

How the Vulnerability Works

From a defender's perspective, CVE-2026-9082 allows an unauthenticated attacker to interfere with the queries that an application makes to its database. By injecting malicious SQL payloads into specific HTTP requests (often via form inputs or API parameters), an attacker can trick the database into revealing, modifying, or deleting data.

In the context of Drupal, which manages content, user credentials, and sensitive configuration data in its database, this vulnerability is a severe breach of the application's trust boundary. Successful exploitation does not require user interaction, making it a prime candidate for automated botnets and mass-exploitation toolkits.

Exploitation Requirements

• Access: Network adjacency (HTTP/HTTPS access to the Drupal frontend).
• Privileges: None (Unauthenticated).
• Complexity: Low.

Detection & Response

Given the active exploitation status, SOC teams must urgently hunt for signs of SQL injection attempts against their web infrastructure. The following detection logic focuses on identifying the anomalous SQL syntax patterns typically used in these attacks within web server access logs.

Sigma Rules

---
title: Potential SQL Injection Exploitation Attempt on Drupal
id: 1a2b3c4d-5e6f-7a8b-9c0d-1e2f3a4b5c6d
status: experimental
description: Detects generic SQL injection patterns in HTTP requests often used to exploit CVE-2026-9082 against Drupal instances.
references:
 - https://nvd.nist.gov/vuln/detail/CVE-2026-9082
author: Security Arsenal
date: 2026/05/15
tags:
 - attack.initial_access
 - attack.t1190
 - cve.2026.9082
logsource:
 category: web
 product: apache
detection:
 selection:
  c-uri|contains:
   - 'UNION SELECT'
   - 'UNION ALL SELECT'
   - '1=1'
   - "' OR '1'='1"
   - "' OR 1=1--"
   - 'information_schema'
 condition: selection
falsepositives:
 - Legitimate application testing
 - Penetration testing activities
level: high
---
title: Drupal Core Anomalous Database Queries
id: 2b3c4d5e-6f7a-8b9c-0d1e-2f3a4b5c6d7e
status: experimental
description: Detects suspicious SQL syntax patterns typically associated with SQLi attacks in Drupal request URIs.
references:
 - https://cisajob.kev.catalog/cve-2026-9082
author: Security Arsenal
date: 2026/05/15
tags:
 - attack.initial_access
 - attack.t1190
logsource:
 category: web
 product: nginx
detection:
 selection:
  c-uri|re: '.*select.*from.*where.*'
  c-uri|contains:
   - 'drupal'
   - 'node'
   - 'user'
 filter:
  cs-method|equals: 'POST'
 condition: selection | not filter
falsepositives:
 - High volume search queries
level: medium

KQL (Microsoft Sentinel / Defender)

// Hunt for SQLi patterns in Web Logs (CommonSecurityLog/CEF)
let SQLiKeywords = dynamic([
  "UNION SELECT", "UNION ALL SELECT", "1=1", "' OR '1'='1", "' OR 1=1--", 
  "information_schema", "ORDER BY 1--", "concat(0x", "waitfor delay"
]);
CommonSecurityLog
| where DeviceProduct in ("Apache", "Nginx", "Drupal", "Web Server")
| where RequestURL has_any (SQLiKeywords)
| project TimeGenerated, SourceIP, DestinationIP, RequestURL, DeviceAction, RequestMethod
| order by TimeGenerated desc

Velociraptor VQL

-- Hunt for Drupal core version file to verify integrity/patch status
-- This identifies potential unpatched targets on the host
SELECT FullPath, Mtime, Size, Mode
FROM glob(globs='/var/www/html/core/lib/Drupal.php')
WHERE Mtime < timestamp("2026-05-01") 
  -- Filter to find files not modified since the patch release window

Remediation Script (Bash)

#!/bin/bash
# Check Drupal Core version for CVE-2026-9082 patch eligibility
# Requires 'composer' or 'drush' to be installed

echo "Checking Drupal Core version..."

# Attempt to get version via Drush
if command -v drush &> /dev/null; then
    DRUPAL_VERSION=$(drush status --format= | grep -o '"drupal-version";s:[0-9]*:"\([^"]*\)"' | cut -d'"' -f4)
    echo "Detected Drupal Version: $DRUPAL_VERSION"
    # Logic to check against secure versions would go here based on vendor advisory
else
    echo "Drush not found. Attempting Composer check..."
    if [ -f "composer.lock" ]; then
        grep -A 3 '"name": "drupal/core"' composer.lock | head -n 4
    else
        echo "Neither Drush nor composer.lock found in current directory."
    fi
fi

Remediation

1. Patch Immediately: Apply the latest security updates released by the Drupal Security Team.
   • Navigate to your Drupal admin dashboard or run composer update drupal/core or drush up.
   • Verify you are running the patched version specific to your branch (e.g., 10.3.x, 11.0.x).
2. CISA KEV Deadline: Federal Civilian Executive Branch (FCEB) agencies must patch this vulnerability by June 5, 2026, per CISA BOD 22-01. Private sector organizations should treat this date as a target for remediation.
3. Web Application Firewall (WAF): If immediate patching is not possible due to change management freezes, implement strict WAF rules to block SQL injection signatures on the perimeter.
4. Log Review: Conduct a retroactive search of web server logs (past 30 days) for the SQL injection patterns listed in the Detection section to determine if compromise has already occurred.
5. Official Advisory: Review the full security advisory at Drupal Security Advisories.

Related Resources

Security Arsenal Penetration Testing Services AlertMonitor Platform Book a SOC Assessment vulnerability-management Intel Hub