CVE-2026-108814 Overview
CVE-2026-108814 is a SQL injection vulnerability in SEMCMS versions up to 5.0. The flaw resides in an unspecified function within the SEMCMS_Banner.php file. Attackers can manipulate input parameters to inject arbitrary SQL into database queries. The attack is executable remotely and requires low-level privileges but no user interaction. A public proof-of-concept exploit has been released on GitHub. The SEMCMS vendor was notified prior to disclosure but did not respond. This classifies as an Improper Neutralization of Special Elements in Output Used by a Downstream Component [CWE-74].
Critical Impact
Remote authenticated attackers can inject SQL statements through SEMCMS_Banner.php, enabling unauthorized read, modification, and limited availability impact on the backend database.
Affected Products
- SEMCMS versions up to and including 5.0
- The vulnerable component is SEMCMS_Banner.php
- No vendor patch is currently available
Discovery Timeline
- 2026-10-12 - CVE CVE-2026-108814 published to NVD
- 2026-10-14 - Last updated in NVD database
Technical Details for CVE-2026-108814
Vulnerability Analysis
The vulnerability exists in SEMCMS, a PHP-based content management system used primarily for multilingual e-commerce sites. The SEMCMS_Banner.php script processes user-supplied parameters without proper sanitization before passing them into SQL statements. An attacker can supply crafted input containing SQL metacharacters to break out of the intended query context. Successful exploitation permits reading database contents, modifying banner records, and potentially altering administrative data. The published proof-of-concept is hosted at the GitHub PoC Repository, which lowers the barrier to opportunistic exploitation.
Root Cause
The root cause is improper neutralization of special elements within an SQL command [CWE-74]. SEMCMS does not use parameterized queries or input validation routines for the parameters processed by SEMCMS_Banner.php. User input is concatenated directly into SQL strings executed against the backend MySQL database. This design flaw allows injection payloads to alter query semantics.
Attack Vector
Exploitation requires network access to the SEMCMS web interface and low-privilege authenticated access. An attacker sends an HTTP request to SEMCMS_Banner.php with crafted parameter values containing SQL syntax. No user interaction is required beyond the attacker's own request. Because the attack is remote and the proof-of-concept is public, administrators of SEMCMS deployments should assume opportunistic scanning will occur. See the VulDB Vulnerability Details entry for additional technical context.
No verified exploitation code is reproduced here. Refer to the GitHub PoC Repository for the published proof-of-concept.
Detection Methods for CVE-2026-108814
Indicators of Compromise
- HTTP requests to /SEMCMS_Banner.php containing SQL metacharacters such as single quotes, UNION SELECT, OR 1=1, or inline comment sequences (--, #, /*)
- Unusual database error messages in web server logs referencing the banner module
- Unexpected modifications to banner, user, or configuration tables within the SEMCMS database
Detection Strategies
- Deploy web application firewall rules that inspect query strings and POST bodies submitted to SEMCMS_Banner.php for SQL injection signatures
- Enable MySQL general query logging and alert on queries originating from the banner module that contain UNION, SLEEP, or stacked statements
- Correlate authenticated session activity with database query anomalies to identify low-privilege accounts probing the banner endpoint
Monitoring Recommendations
- Monitor web access logs for repeated 500-series responses from SEMCMS_Banner.php indicating failed injection attempts
- Track database CPU and query latency spikes that may indicate time-based blind SQL injection
- Review authentication logs for low-privilege accounts accessing administrative banner functionality
How to Mitigate CVE-2026-108814
Immediate Actions Required
- Restrict network access to the SEMCMS administrative interface using IP allowlisting or VPN enforcement
- Audit all low-privilege SEMCMS accounts and remove unused or shared credentials
- Place a web application firewall in front of the SEMCMS deployment with SQL injection protection enabled
Patch Information
No vendor patch is available at the time of publication. The SEMCMS vendor did not respond to the disclosure. Administrators should subscribe to the VulDB CVE-2026-108814 entry for updates and evaluate alternative CMS platforms if a fix is not forthcoming.
Workarounds
- Block external access to SEMCMS_Banner.php at the reverse proxy or web server layer until a vendor fix is released
- Apply custom input validation filters at the web server level to reject requests containing SQL metacharacters targeting the banner endpoint
- Implement database account separation so the SEMCMS application connects with the minimum privileges required, preventing cross-table escalation
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
