CVE-2026-40814 Overview
CVE-2026-40814 is an unauthenticated SQL Injection vulnerability in the dataapi.php file's _mb24confi_getTagAlarm function. The flaw stems from improper neutralization of special elements within a SQL SELECT command [CWE-89]. Remote attackers can exploit the issue over the network without authentication or user interaction. Successful exploitation results in a total loss of confidentiality of backend database contents. The vulnerability was published to the National Vulnerability Database (NVD) on 2026-05-27 and is tracked under CERT-VDE advisory VDE-2026-044.
Critical Impact
Unauthenticated remote attackers can extract sensitive database contents by injecting malicious SQL into the _mb24confi_getTagAlarm function, resulting in total loss of confidentiality.
Affected Products
- Affected product details not published in the NVD entry at time of writing
- Refer to the CERT-VDE Security Advisory for vendor and version information
- The vulnerable component is the dataapi.php script
Discovery Timeline
- 2026-05-27 - CVE-2026-40814 published to NVD
- 2026-05-27 - Last updated in NVD database
Technical Details for CVE-2026-40814
Vulnerability Analysis
The vulnerability resides in the _mb24confi_getTagAlarm function inside dataapi.php. The function builds a SQL SELECT query using attacker-supplied input without applying parameterized queries or input sanitization. This allows an attacker to break out of the intended query context and append arbitrary SQL clauses.
Because the endpoint does not require authentication, an attacker can reach the function directly over the network. The Exploit Prediction Scoring System (EPSS) lists the probability of exploitation at 0.049% as of 2026-05-28, and no public exploit code has been disclosed. The CWE-89 classification confirms that the root issue is improper neutralization of special elements used in SQL commands.
Root Cause
The root cause is the direct concatenation of untrusted input into a SQL SELECT statement within _mb24confi_getTagAlarm. The function does not use prepared statements, parameter binding, or strict input validation, leaving query syntax under attacker control.
Attack Vector
The attack vector is network-based and requires no privileges or user interaction. An attacker sends a crafted HTTP request to the dataapi.php endpoint, injecting SQL payloads into the parameter consumed by _mb24confi_getTagAlarm. The attacker can then enumerate database schema and exfiltrate stored records.
No verified exploit code is available. See the CERT-VDE Security Advisory for vendor-supplied technical details.
Detection Methods for CVE-2026-40814
Indicators of Compromise
- HTTP requests targeting dataapi.php that contain SQL meta-characters such as single quotes, UNION SELECT, --, or /* comment sequences
- Requests referencing the _mb24confi_getTagAlarm function or related tag alarm parameters from unauthenticated sources
- Database error messages or unusually large response payloads returned from dataapi.php
- Repeated requests from a single source enumerating parameter values against dataapi.php
Detection Strategies
- Inspect web server and application logs for anomalous query strings or POST bodies sent to dataapi.php
- Deploy web application firewall (WAF) rules that flag SQL injection signatures targeting the affected endpoint
- Correlate unauthenticated access to dataapi.php with subsequent spikes in database query volume
Monitoring Recommendations
- Forward web server, application, and database audit logs to a centralized analytics platform for correlation
- Alert on SQL syntax errors emitted by the database engine, which often indicate injection probing
- Monitor outbound network flows from the application server for unexpected data egress following suspicious requests
How to Mitigate CVE-2026-40814
Immediate Actions Required
- Apply the vendor patch as soon as it is released; review the CERT-VDE Security Advisory for fixed versions
- Restrict network access to dataapi.php to trusted management networks until patching is complete
- Review web server and database logs for indicators of prior exploitation attempts
Patch Information
Refer to the CERT-VDE Security Advisory VDE-2026-044 for vendor patch availability and upgrade guidance. The NVD entry does not list fixed product versions at the time of publication.
Workarounds
- Block external access to dataapi.php at the perimeter firewall or reverse proxy
- Deploy WAF rules that block SQL injection payloads targeting the _mb24confi_getTagAlarm parameter
- Enforce least-privilege database accounts so that the application service user cannot read sensitive tables beyond what is required
- Enable database query logging to capture injection attempts for forensic review
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
