CVE-2026-11851 Overview
CVE-2026-11851 is a SQL Injection vulnerability [CWE-89] affecting the web management interface of certain ASUS router models. The flaw allows a remote authenticated user to bypass existing input validation using a crafted request. Successful exploitation leads to disclosure of confidential information stored by the router.
The vulnerability requires valid credentials and a network path to the management interface. ASUS has published guidance in the Security Update for ASUS Router Firmware section of its security advisory portal.
Critical Impact
Authenticated attackers can extract confidential data from affected ASUS router databases by injecting SQL through the web management interface.
Affected Products
- Certain ASUS router models running vulnerable firmware versions
- ASUS router web management interface component
- Specific model list published in the ASUS Security Advisory
Discovery Timeline
- 2026-07-15 - CVE-2026-11851 published to the National Vulnerability Database
- 2026-07-15 - Last updated in NVD database
Technical Details for CVE-2026-11851
Vulnerability Analysis
The vulnerability resides in the web management interface of affected ASUS routers. Input passed through one or more request parameters is incorporated into SQL statements without adequate neutralization. Existing input validation logic can be bypassed with specially crafted request syntax.
Exploitation requires an authenticated session with high privileges on the target device. Once authenticated, an attacker sends crafted HTTP requests to the management interface. The injected SQL is executed by the backend database, returning data the user should not otherwise access.
The impact is limited to confidentiality. The advisory does not describe integrity or availability effects, and the attack complexity is elevated because the attacker must construct payloads that defeat the existing validation routines.
Root Cause
The root cause is improper neutralization of special elements used in SQL commands [CWE-89]. The affected code paths concatenate untrusted request data into SQL queries rather than using parameterized statements. Validation routines fail to sanitize edge-case syntax that reaches the query builder.
Attack Vector
The attack vector is network-based against the router's web management interface. An attacker with valid administrative credentials submits crafted HTTP requests containing SQL metacharacters. Successful requests coerce the backend database into returning confidential records.
Refer to the ASUS Security Advisory for parameter-level technical details and the list of affected firmware builds.
Detection Methods for CVE-2026-11851
Indicators of Compromise
- Unexpected authenticated sessions to the router web management interface from unfamiliar source addresses
- HTTP request bodies or query strings containing SQL metacharacters such as single quotes, UNION, SELECT, or comment sequences targeting management endpoints
- Anomalous response sizes or timing patterns on management interface requests that indicate data exfiltration
Detection Strategies
- Inspect router and upstream firewall logs for authenticated access to the web management interface from non-administrative networks
- Deploy web application firewall or network intrusion detection signatures matching SQL injection payloads against router management URLs
- Correlate administrator login events with subsequent bursts of management interface requests to identify credential misuse
Monitoring Recommendations
- Restrict remote WAN administration and monitor any enablement of the remote management setting
- Track firmware version reporting across the router fleet to identify devices running vulnerable builds
- Alert on repeated failed and successful administrator logins that indicate credential stuffing preceding exploitation
How to Mitigate CVE-2026-11851
Immediate Actions Required
- Apply the firmware update referenced in the ASUS Security Advisory as soon as it is available for the affected model
- Rotate router administrator credentials and enforce strong, unique passwords
- Disable remote WAN access to the web management interface until the device is patched
Patch Information
ASUS provides remediation guidance in the Security Update for ASUS Router Firmware section of the ASUS Security Advisory. Administrators should identify their model, download the corresponding firmware release, and validate the running version after upgrade.
Workarounds
- Limit access to the web management interface to trusted LAN segments only
- Place the router management interface behind a network access control list that permits only administrator workstations
- Disable any features that expose the management interface to the internet, including remote administration and cloud management
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
