CVE-2026-103668 Overview
CVE-2026-103668 is an SQL injection vulnerability [CWE-89] affecting the Site Search function of Movable Type, a content management system developed by Six Apart. The flaw allows an unauthenticated remote attacker to execute arbitrary SQL queries against the backend database through crafted search requests. Exploitation requires no authentication, no user interaction, and can be performed over the network. The vendor released Movable Type 9.3.0 to address the issue on October 7, 2026.
Critical Impact
Unauthenticated attackers can execute arbitrary SQL queries against the Movable Type database, potentially exposing content, user credentials, and configuration data.
Affected Products
- Movable Type (Site Search function) versions prior to 9.3.0
- Six Apart Movable Type distributions patched via the October 7, 2026 vendor advisory
- Deployments exposing the Site Search endpoint to untrusted networks
Discovery Timeline
- 2026-10-07 - Movable Type 9.3.0 released with the fix by Six Apart
- 2026-10-07 - CVE-2026-103668 published to NVD
- 2026-10-07 - Last updated in NVD database
Technical Details for CVE-2026-103668
Vulnerability Analysis
The vulnerability resides in the Site Search function of Movable Type. User-controllable search parameters are concatenated into SQL statements without proper parameterization or sanitization. An unauthenticated attacker can submit crafted HTTP requests to the search endpoint and inject SQL syntax that alters the intended query.
Successful exploitation can disclose arbitrary database content, including author credentials, draft entries, and configuration tables. Depending on database privileges, an attacker may also modify records or trigger database-level routines. The attack is reachable over the network and requires no privileges.
Root Cause
The root cause is improper neutralization of special elements used in an SQL command [CWE-89]. Input supplied to the Site Search handler is incorporated directly into query strings rather than passed as bound parameters, allowing attacker-controlled syntax to be interpreted by the database engine.
Attack Vector
Exploitation occurs through HTTP requests to the Site Search endpoint exposed by a Movable Type installation. The attacker injects SQL metacharacters and clauses, such as UNION SELECT statements or boolean-based payloads, into the search parameters. Because no authentication is required, any client reachable to the application can attempt exploitation. Refer to the JVN Security Advisory JVN91153973 and the Movable Type 9.3.0 Release notes for additional vendor technical context.
Detection Methods for CVE-2026-103668
Indicators of Compromise
- HTTP requests to the Movable Type Site Search endpoint containing SQL metacharacters such as ', --, UNION, SELECT, or SLEEP(
- Database error messages or unusually large response bodies returned from search queries
- Spikes in search request volume from a single source IP or user agent
- Unexpected read activity against sensitive tables such as mt_author or mt_session
Detection Strategies
- Deploy web application firewall signatures that identify SQL injection patterns targeting Movable Type search URIs
- Enable database query logging and alert on unexpected UNION, INFORMATION_SCHEMA, or time-delay functions originating from the web application account
- Correlate HTTP access logs with database audit logs to identify search requests that generate anomalous query shapes
Monitoring Recommendations
- Monitor outbound traffic from the Movable Type host for unusual data egress following search activity
- Track authentication attempts and administrative actions that follow suspicious search traffic, which may indicate credential theft
- Review scheduled jobs and new author accounts for unauthorized changes after suspected probing
How to Mitigate CVE-2026-103668
Immediate Actions Required
- Upgrade Movable Type to version 9.3.0 or later as published in the Six Apart Movable Type Update
- Restrict network access to the Site Search endpoint from untrusted sources until patching is complete
- Review web server and database logs for signs of prior exploitation attempts
- Rotate credentials for database users and Movable Type authors if compromise is suspected
Patch Information
Six Apart addressed the vulnerability in Movable Type 9.3.0, released on October 7, 2026. Administrators should review the Movable Type 9.3.0 Release notes and apply the update across all affected instances, including staging and development environments.
Workarounds
- Place the Movable Type application behind a web application firewall with SQL injection rules enabled
- Temporarily disable the Site Search function if business operations permit until the patch is deployed
- Enforce IP allowlisting on the search endpoint to limit exposure to known, trusted sources
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
