CISA Warns of Active Exploitation of Critical Drupal SQL Injection Vulnerability CVE-2026-9082

Executive Summary

A critical vulnerability in Drupal core, identified as CVE-2026-9082, is under active mass exploitation. The flaw is an unauthenticated SQL injection that affects Drupal sites configured to use a PostgreSQL database. With a CVSS v3.1 score of 9.8 (Critical), the vulnerability can be exploited by a remote, unauthenticated attacker to execute arbitrary SQL commands. This can lead to a complete compromise of the site, including data theft, unauthorized privilege escalation, and potentially remote code execution (RCE). The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added CVE-2026-9082 to its Known Exploited Vulnerabilities (KEV) catalog, confirming widespread attacks and requiring federal agencies to patch immediately.

Vulnerability Details

• CVE ID: CVE-2026-9082

• Severity: Critical (CVSS 9.8)

• Vulnerability Type: SQL Injection

• Authentication: Not required

• Attack Vector: Network

• The vulnerability exists in a component of Drupal's database abstraction layer when processing certain SQL queries for PostgreSQL databases. An attacker can craft a malicious request to a vulnerable Drupal site and inject arbitrary SQL commands. Because no authentication is needed, this flaw is particularly dangerous and easily weaponized for automated, large-scale attacks. Successful exploitation grants the attacker the same level of database access as the Drupal application itself, which often means full read/write access to all site data.

Affected Systems

The vulnerability affects Drupal core sites that meet the following criteria:

• Running a vulnerable version of Drupal (specific versions to be confirmed by Drupal security advisories).
• Using PostgreSQL as the backend database.

Sites using other databases like MySQL or MariaDB are not affected by this specific flaw.

Exploitation Status

As predicted by the Drupal security team, exploitation began almost immediately after the patch was released. Security firms are tracking thousands of automated attack attempts from a wide range of IP addresses. The addition of CVE-2026-9082 to the CISA KEV catalog serves as definitive proof of active, in-the-wild exploitation. Attackers are scanning the internet for vulnerable Drupal sites to compromise them at scale.

Impact Assessment

The impact of a successful exploit is severe. An attacker can:

• Disclose Sensitive Information: Read all data from the database, including user accounts, passwords (hashed), content, and other sensitive information.
• Modify or Delete Data: Alter or destroy site content and user data.
• Escalate Privileges: Create new administrative accounts or elevate the privileges of existing accounts, giving them full control over the Drupal site.
• Achieve Remote Code Execution: In some PostgreSQL configurations, it may be possible to leverage database functions to execute arbitrary commands on the underlying server, leading to a full system compromise.

Cyber Observables — Hunting Hints

The following patterns may help identify vulnerable or compromised systems:

Detection Methods

1. Web Application Firewall (WAF): Deploy a WAF with rulesets designed to block common SQL injection patterns. While not foolproof, this can block many automated scanning attempts. Virtual patching rules specific to CVE-2026-9082 may be available from WAF vendors.
2. Log Analysis: Ingest and analyze web server and database logs in a SIEM. Create alerts for a high volume of error responses (e.g., HTTP 500) or for requests containing SQL syntax from a single IP address.
3. File Integrity Monitoring (FIM): Use FIM on your web server to detect the creation of new files (web shells) in your Drupal installation directories.

Remediation Steps

1. PATCH IMMEDIATELY: The most critical step is to update to the latest version of Drupal core as specified in the official security advisory. This is the only way to fully remediate the vulnerability.
2. Check for Compromise: If patching was delayed, assume compromise. Review web server and database logs for signs of exploitation. Check for new administrative users in Drupal and unexpected files on the server.
3. Restore from Backup: If a compromise is confirmed, the safest course of action is to restore the site from a clean backup taken before the vulnerability was disclosed and then apply the patch.
4. Rotate Credentials: After restoring and patching, rotate all secrets, including database credentials, API keys, and user passwords.