CVE-2026-30995: Slah CMS SQL Injection Vulnerability

CVE-2026-30995 Overview

CVE-2026-30995 is a SQL Injection vulnerability affecting Slah CMS version 1.5.0 and earlier. The vulnerability exists in the vereador_ver.php endpoint where the id parameter is not properly sanitized, allowing attackers to inject malicious SQL queries. This flaw enables unauthorized access to sensitive database information, potential data manipulation, and limited impact on system availability.

Critical Impact

Unauthenticated attackers can exploit this SQL injection vulnerability to extract sensitive data from the database, modify records, and potentially compromise the entire CMS installation.

Affected Products

• Slah CMS v1.5.0 and below
• Slah CMS installations with the vereador_ver.php endpoint exposed

Discovery Timeline

• 2026-04-15 - CVE-2026-30995 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2026-30995

Vulnerability Analysis

This SQL Injection vulnerability (CWE-89) occurs when user-supplied input through the id parameter in vereador_ver.php is directly incorporated into SQL queries without proper sanitization or parameterization. The attack can be executed remotely without authentication and requires no user interaction, making it particularly dangerous for exposed Slah CMS installations.

The vulnerability allows attackers to manipulate database queries, potentially leading to unauthorized data access, data modification, and denial of service conditions. The impact is most significant on data confidentiality, with additional risks to data integrity and system availability.

Root Cause

The root cause of this vulnerability is improper input validation and the use of unsanitized user input in SQL query construction. The vereador_ver.php endpoint accepts an id parameter that is directly concatenated into SQL statements rather than using prepared statements or parameterized queries. This classic SQL injection pattern allows attackers to break out of the intended query context and execute arbitrary SQL commands.

Attack Vector

The attack is network-based and requires no authentication or user interaction. An attacker can craft malicious HTTP requests containing SQL injection payloads in the id parameter of the vereador_ver.php endpoint. By manipulating this parameter, attackers can:

1. Extract sensitive data from the database using UNION-based or blind SQL injection techniques
2. Modify or delete database records
3. Potentially escalate privileges within the application
4. Cause denial of service by executing resource-intensive queries

The vulnerability can be exploited through simple GET or POST requests to the vulnerable endpoint, making automated exploitation straightforward.

Detection Methods for CVE-2026-30995

Indicators of Compromise

• Unusual SQL error messages in application logs referencing the vereador_ver.php endpoint
• HTTP requests to vereador_ver.php containing SQL syntax characters such as single quotes, UNION statements, or comment sequences
• Database query logs showing malformed or suspicious queries originating from the CMS application
• Unexpected data exfiltration patterns or large response sizes from the vulnerable endpoint

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect SQL injection patterns in the id parameter
• Monitor HTTP access logs for requests to vereador_ver.php containing encoded SQL keywords or injection payloads
• Deploy intrusion detection systems with signatures for common SQL injection attack patterns
• Enable verbose database logging and alert on query syntax errors or unusual query patterns

Monitoring Recommendations

• Configure alerts for repeated failed SQL queries or database errors
• Monitor for unusual database activity patterns such as bulk data reads or schema enumeration attempts
• Implement rate limiting on the vereador_ver.php endpoint to slow down automated exploitation attempts
• Review web server access logs regularly for suspicious parameter values in requests

How to Mitigate CVE-2026-30995

Immediate Actions Required

• Restrict access to the vereador_ver.php endpoint through firewall rules or .htaccess configuration until a patch is applied
• Implement input validation at the web server level to reject requests with suspicious characters in the id parameter
• Deploy a Web Application Firewall with SQL injection protection enabled
• Review database user permissions and apply the principle of least privilege to the CMS database account
• Back up all database content before applying any mitigation measures

Patch Information

No official vendor patch information is currently available in the CVE data. Organizations should monitor the CVE-2026-30995 Information page and the SQL Injection Vulnerability Report for updates from the vendor regarding security patches.

Workarounds

• Disable or remove the vereador_ver.php file if the functionality is not required
• Implement server-side input validation to allow only numeric values in the id parameter
• Use a reverse proxy with request filtering capabilities to sanitize incoming requests
• Apply virtual patching through WAF rules while awaiting an official vendor fix

# Apache .htaccess workaround to restrict access to vulnerable endpoint
<Files "vereador_ver.php">
    # Allow only numeric id parameter values
    RewriteEngine On
    RewriteCond %{QUERY_STRING} id=.*[^0-9].* [NC]
    RewriteRule .* - [F,L]
</Files>