CVE-2026-9082: Drupal Core SQL Injection Vulnerability

CVE-2026-9082 Overview

CVE-2026-9082 is an SQL injection vulnerability in Drupal core caused by improper neutralization of special elements used in SQL commands [CWE-89]. The flaw allows attackers to inject crafted SQL statements through network-accessible inputs without authentication or user interaction. Successful exploitation can expose limited confidential database content and modify limited data within affected installations. The vulnerability affects Drupal core versions 8.9.0 through the patched releases listed in the Drupal Security Advisory. Site operators running unpatched branches face direct risk to the underlying database backing their Drupal deployments.

Critical Impact

Unauthenticated network attackers can inject SQL statements into Drupal core, leading to limited disclosure and modification of database contents.

Affected Products

• Drupal core 8.9.0 before 10.4.10
• Drupal core 10.5.0 before 10.5.10, and 10.6.0 before 10.6.9
• Drupal core 11.0.0 before 11.1.10, 11.2.0 before 11.2.12, and 11.3.0 before 11.3.10

Discovery Timeline

• 2026-05-20 - CVE-2026-9082 published to NVD
• 2026-05-20 - Last updated in NVD database

Technical Details for CVE-2026-9082

Vulnerability Analysis

The vulnerability resides in Drupal core's database abstraction layer where user-supplied input is concatenated into SQL statements without proper neutralization of special characters. An unauthenticated attacker can craft HTTP requests containing SQL metacharacters that alter query semantics on the backend database. Exploitation requires no privileges and no user interaction, and the attack is launchable from any network position that can reach the Drupal site.

The impact is bounded but meaningful. Attackers can read and modify portions of the database accessible to the executing query, including configuration, session, or content tables depending on the affected code path. The issue is classified under CWE-89 - Improper Neutralization of Special Elements used in an SQL Command.

Root Cause

The root cause is improper sanitization or parameterization of input values used in SQL queries within Drupal core. When special characters such as single quotes, semicolons, or comment sequences are passed to the query builder without being treated as data, the database engine interprets them as part of the SQL grammar. This breaks the boundary between code and data that parameterized queries normally enforce.

Attack Vector

The attack vector is network-based and unauthenticated. An attacker sends crafted HTTP requests to a vulnerable Drupal endpoint with parameter values designed to escape the intended SQL context. The injected payload then executes against the configured database backend (MySQL, MariaDB, PostgreSQL, or SQLite). Public exploitation code is not currently available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

No verified proof-of-concept code has been published. Refer to the Drupal Security Advisory SA-CORE-2026-004 for vendor technical details.

Detection Methods for CVE-2026-9082

Indicators of Compromise

• Web server access logs containing SQL metacharacters such as ', --, UNION SELECT, OR 1=1, or URL-encoded equivalents in query parameters or POST bodies sent to Drupal endpoints.
• Database error messages or unusually long response times correlating with requests to Drupal routes.
• Unexpected new or modified rows in users_field_data, config, or session tables that do not correspond to administrative activity.

Detection Strategies

• Deploy web application firewall rules that flag SQL injection patterns targeting Drupal request paths and parameter names.
• Enable database query logging and alert on syntactically anomalous queries originating from the Drupal application user.
• Correlate HTTP 500 responses from Drupal with parameter values containing SQL metacharacters to surface failed injection attempts.

Monitoring Recommendations

• Monitor the Drupal version reported by deployed sites and verify it meets or exceeds the patched releases listed in SA-CORE-2026-004.
• Track outbound database traffic for unusual volume or query patterns that may indicate enumeration via blind SQL injection.
• Review administrative account creation, role assignment, and permission changes on a recurring schedule.

How to Mitigate CVE-2026-9082

Immediate Actions Required

• Upgrade Drupal core to 10.4.10, 10.5.10, 10.6.9, 11.1.10, 11.2.12, or 11.3.10 depending on the branch in use.
• Audit web server and database logs for injection attempts predating the patch deployment.
• Rotate database credentials and any secrets stored in the Drupal configuration if compromise is suspected.

Patch Information

The Drupal Security Team released fixed versions across all supported branches. Apply the appropriate upgrade as documented in the Drupal Security Advisory SA-CORE-2026-004. Sites running end-of-life branches must upgrade to a supported branch to receive the fix.

Workarounds

• Place a web application firewall in front of the Drupal site with SQL injection signatures enabled until patching is complete.
• Restrict the database account used by Drupal to the minimum privileges required, removing rights to schema modification and cross-database access.
• Limit administrative and authenticated endpoint exposure to trusted networks where operationally feasible.

# Update Drupal core via Composer to a patched release
composer require drupal/core-recommended:^10.6.9 \
  drupal/core-composer-scaffold:^10.6.9 \
  drupal/core-project-message:^10.6.9 --update-with-all-dependencies

# Apply pending database updates
vendor/bin/drush updatedb -y
vendor/bin/drush cache:rebuild