CVE-2026-4779: Sales And Inventory System SQLi Vulnerability

CVE-2026-4779 Overview

CVE-2026-4779 is a SQL injection vulnerability affecting SourceCodester Sales and Inventory System 1.0. The flaw resides in update_customer_details.php and stems from improper handling of the sid HTTP GET parameter. An authenticated remote attacker can manipulate the sid argument to inject arbitrary SQL statements into the backend database query. The vulnerability is classified under CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component). A public proof-of-concept has been disclosed, increasing the risk of opportunistic exploitation against exposed deployments.

Critical Impact

Authenticated attackers can inject SQL via the sid parameter of update_customer_details.php, potentially disclosing or modifying database records in the Sales and Inventory System.

Affected Products

• SourceCodester Sales and Inventory System 1.0
• Component: HTTP GET Parameter Handler in update_customer_details.php
• CPE: cpe:2.3:a:ahsanriaz26gmailcom:sales_and_inventory_system:1.0:*:*:*:*:*:*:*

Discovery Timeline

• 2026-03-24 - CVE-2026-4779 published to the National Vulnerability Database (NVD)
• 2026-04-29 - Last updated in NVD database

Technical Details for CVE-2026-4779

Vulnerability Analysis

The vulnerability exists in the update_customer_details.php script of SourceCodester Sales and Inventory System 1.0. The application reads the sid parameter from an HTTP GET request and concatenates it directly into a SQL statement without parameterization or input sanitization. An attacker authenticated to the application can supply crafted SQL fragments in sid to alter query logic. Successful exploitation enables disclosure of customer records, manipulation of stored data, or chained attacks against database functionality. The attack requires network access to the application and low privileges, with no user interaction needed.

Root Cause

The underlying defect is the absence of prepared statements or input validation when handling the sid GET parameter. The application trusts untrusted user input and embeds it into a dynamic SQL query string. This pattern allows the query parser to interpret attacker-controlled characters such as single quotes, comments, and union operators as SQL syntax rather than data. The classification under [CWE-74] reflects the broader injection class encompassing this flaw.

Attack Vector

Exploitation occurs remotely over HTTP. An attacker sends a crafted GET request to update_customer_details.php with a malicious value for sid. Because the parameter is interpolated into the SQL query, payloads using boolean logic, UNION SELECT, or time-based blind techniques can extract data or alter records. The public proof-of-concept is documented in the GitHub SQL Injection PoC repository. Additional context is available via VulDB entry #352797.

No verified exploit code is reproduced here. Refer to the linked references for technical details of the payload structure.

Detection Methods for CVE-2026-4779

Indicators of Compromise

• HTTP GET requests to update_customer_details.php containing SQL metacharacters such as ', --, ;, UNION, SELECT, or SLEEP( within the sid parameter.
• Unusually long sid values or URL-encoded SQL keywords in web server access logs.
• Database error messages or unexpected query latency correlated with requests to the vulnerable endpoint.

Detection Strategies

• Deploy a web application firewall (WAF) rule that inspects the sid query parameter for SQL injection signatures.
• Enable database query logging and alert on parameterized queries originating from update_customer_details.php that contain unexpected tokens.
• Review authentication logs for accounts issuing repeated requests to the customer update endpoint within short intervals.

Monitoring Recommendations

• Forward web server, application, and database logs to a centralized analytics platform for correlation across the request, query, and response stages.
• Establish baselines for normal sid parameter values to surface anomalous payload patterns.
• Monitor for outbound data volume spikes from the database host that could indicate bulk record exfiltration.

How to Mitigate CVE-2026-4779

Immediate Actions Required

• Restrict network access to the Sales and Inventory System to trusted users and source IP ranges until a fix is applied.
• Audit application accounts and revoke unnecessary access to limit who can reach update_customer_details.php.
• Inspect recent web and database logs for evidence of sid-based injection attempts and validate database integrity.

Patch Information

No official vendor patch or advisory is listed in the enriched data for CVE-2026-4779. Operators should monitor the SourceCodester project page for fixes and consult the VulDB CTI entry #352797 for any vendor coordination updates.

Workarounds

• Place the application behind a WAF configured to block SQL injection patterns targeting the sid parameter.
• Apply a server-side input filter that rejects non-numeric values for sid if the field is expected to be an integer identifier.
• If feasible, modify update_customer_details.php to use prepared statements with bound parameters in place of string concatenation.
• Run the database account used by the application with the minimum privileges required, removing rights such as DROP, ALTER, and FILE.

# Example WAF rule (ModSecurity) to block SQLi attempts on sid parameter
SecRule ARGS:sid "@rx (?i)(union(.*?)select|sleep\(|--|';|/\*)" \
    "id:1004779,phase:2,deny,status:403,\
    msg:'CVE-2026-4779 SQLi attempt in sid parameter'"