CVE-2026-48613 Overview
CVE-2026-48613 is a SQL injection vulnerability [CWE-89] in the phpBB forum software. The flaw exists in the profile field migration logic, which fails to properly sanitize user-supplied profile field data during the migration process. An authenticated attacker can inject arbitrary SQL queries through crafted profile field values processed by the migration routine.
The vulnerability only affects phpBB forums that were upgraded from versions prior to 3.3.8 and have not yet been updated to version 3.3.11 or later. Exploitation requires user interaction and elevated conditions, which limits real-world attack reliability.
Critical Impact
Successful exploitation allows execution of arbitrary SQL queries against the forum database, exposing user credentials, private messages, and forum content.
Affected Products
- phpBB forums upgraded from versions prior to 3.3.8
- phpBB installations not yet updated to 3.3.11 or newer
- phpBB profile field migration component
Discovery Timeline
- 2026-06-12 - CVE-2026-48613 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2026-48613
Vulnerability Analysis
The vulnerability resides in the phpBB database migration routine that processes legacy profile field data. When administrators upgrade from a phpBB version older than 3.3.8, the migration script reads profile field definitions and values from the existing database and rewrites them into the new schema. The migration code concatenates user-controlled profile field data directly into SQL statements without parameterized query binding.
An attacker with the ability to set profile field values prior to the migration can stage a malicious payload. When an administrator subsequently runs the upgrade, the payload is executed in the SQL context of the migration process. The attack vector is network-based but requires user interaction from an administrator triggering the upgrade.
Root Cause
The root cause is improper neutralization of special elements used in an SQL command [CWE-89]. The phpBB migration code path treats profile field data as trusted because it originated within the application. The migration routine bypasses the parameterized query mechanisms used elsewhere in the codebase, allowing embedded SQL syntax in profile field content to alter query structure.
Attack Vector
Exploitation requires three preconditions. First, the target forum must have been upgraded from a phpBB release older than 3.3.8. Second, the forum must remain on a version older than 3.3.11. Third, an authenticated attacker must inject malicious content into a profile field, and an administrator must execute the migration. The attacker stores the SQL payload in a profile field value. When the migration script processes that value, the embedded SQL is executed against the database.
No verified exploit code is publicly available. For technical context, refer to the phpBB Community Discussion.
Detection Methods for CVE-2026-48613
Indicators of Compromise
- Unexpected UNION SELECT, INSERT, or UPDATE statements appearing in phpBB database query logs during migration windows
- Profile field values containing SQL syntax fragments such as quote characters, comment markers (--, /*), or statement separators (;)
- New or modified administrator accounts created during or shortly after a phpBB upgrade
- Anomalous database query errors logged during execution of the profile field migration step
Detection Strategies
- Audit the phpbb_profile_fields_data and related tables for entries containing SQL metacharacters before performing any upgrade
- Review web server access logs for profile editing requests submitting payloads with SQL keywords
- Enable database query logging during the migration and inspect output for statements outside the expected migration schema operations
Monitoring Recommendations
- Monitor phpBB administrator activity for unscheduled migration or upgrade executions
- Track database user activity for privilege changes or unexpected schema modifications following an upgrade
- Alert on outbound connections initiated by the web server during or after the migration process
How to Mitigate CVE-2026-48613
Immediate Actions Required
- Update phpBB to version 3.3.11 or later before running any pending profile field migrations
- Inspect existing profile field data for SQL injection payloads prior to executing the migration
- Restrict profile field editing permissions to trusted user groups until the patch is applied
- Take a verified database backup before initiating the upgrade procedure
Patch Information
The phpBB project addressed the vulnerability in version 3.3.11. Administrators of forums originally installed at versions earlier than 3.3.8 must upgrade directly to 3.3.11 or newer to ensure the patched migration logic runs against legacy profile field data. See the phpBB Community Discussion for release details.
Workarounds
- Disable custom profile fields entirely until the upgrade to 3.3.11 or later is completed
- Sanitize the contents of profile field tables manually, removing entries that contain SQL syntax before migration
- Limit database account privileges used by phpBB to the minimum required, reducing the impact of injected queries
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
