CVE-2026-11558 Overview
CVE-2026-11558 is a SQL injection vulnerability affecting CodeAstro Payroll System 1.0. The flaw resides in an unspecified function within the /home_salary.php file. Attackers can manipulate the rate or salary_rate parameters to inject arbitrary SQL statements into backend database queries. The vulnerability is exploitable remotely over the network and requires only low-level privileges. A public exploit disclosure has been documented, increasing the likelihood of opportunistic abuse. The weakness is categorized under CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component).
Critical Impact
Authenticated remote attackers can inject SQL statements through the rate/salary_rate parameter in /home_salary.php, potentially exposing or modifying payroll database records.
Affected Products
- CodeAstro Payroll System 1.0
- /home_salary.php endpoint
- Deployments using the rate and salary_rate request parameters
Discovery Timeline
- 2026-06-08 - CVE-2026-11558 published to NVD
- 2026-06-09 - Last updated in NVD database
Technical Details for CVE-2026-11558
Vulnerability Analysis
The vulnerability is a server-side SQL injection in the CodeAstro Payroll System 1.0 web application. The /home_salary.php script accepts user-supplied input through the rate and salary_rate parameters. The application concatenates these values directly into a SQL query without parameterized statements or input sanitization. As a result, an authenticated attacker can break out of the intended query context and append arbitrary SQL clauses. Public disclosure of exploitation details lowers the technical barrier for adversaries seeking to weaponize the issue.
Root Cause
The root cause is improper neutralization of special elements in a downstream SQL query, classified as [CWE-74]. The application trusts request parameter values and inlines them into dynamic SQL strings. The absence of prepared statements or strict input validation allows attacker-controlled characters such as quotes, comments, and union operators to alter query semantics.
Attack Vector
The attack vector is network-based and remote. An attacker with low-privilege application access submits crafted HTTP requests containing malicious payloads in the rate or salary_rate parameters of /home_salary.php. Successful exploitation can lead to unauthorized read or modification of payroll records, including salary, rate, and employee information. No user interaction is required.
No verified proof-of-concept code is published in the referenced advisories. Refer to the VulDB advisory and the GitHub findings report for additional context.
Detection Methods for CVE-2026-11558
Indicators of Compromise
- HTTP POST or GET requests to /home_salary.php containing SQL meta-characters such as ', --, UNION, or SLEEP( in the rate or salary_rate parameters.
- Unexpected database error messages or query latency spikes correlated with requests to /home_salary.php.
- Authenticated sessions issuing repeated parameter-tampering attempts against payroll endpoints.
Detection Strategies
- Deploy web application firewall (WAF) rules that flag SQL injection patterns in rate and salary_rate query parameters.
- Enable database query logging and alert on anomalous queries originating from the payroll application service account.
- Correlate web server access logs with authentication events to identify low-privilege users probing /home_salary.php.
Monitoring Recommendations
- Forward web server, application, and database logs to a centralized analytics platform for retention and query.
- Establish baselines for normal request volume and parameter content on /home_salary.php to identify deviations.
- Monitor outbound database traffic and table-level read counts for unusual access to payroll tables.
How to Mitigate CVE-2026-11558
Immediate Actions Required
- Restrict network exposure of the CodeAstro Payroll System 1.0 to trusted internal networks or VPN-only access.
- Audit existing application accounts and revoke unused low-privilege credentials that could be leveraged to reach /home_salary.php.
- Review database logs for evidence of prior exploitation against payroll tables.
Patch Information
No vendor patch is listed in the referenced advisories at the time of publication. Operators should monitor the CodeAstro website and the VulDB entry for CVE-2026-11558 for updates. Until a fix is released, apply compensating controls and rewrite affected SQL statements to use parameterized queries.
Workarounds
- Implement a WAF rule that blocks requests to /home_salary.php containing SQL meta-characters in the rate or salary_rate parameters.
- Enforce server-side input validation that restricts these parameters to numeric values only.
- Replace dynamic SQL with prepared statements using PDO or mysqli parameter binding in the affected PHP source.
- Apply least-privilege permissions to the database account used by the application to limit the impact of injection.
# Example ModSecurity rule fragment to block SQLi against the affected endpoint
SecRule REQUEST_URI "@beginsWith /home_salary.php" \
"phase:2,chain,deny,status:403,id:1011558,msg:'Possible SQLi in rate/salary_rate'"
SecRule ARGS:rate|ARGS:salary_rate "@detectSQLi" "t:none"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
