CVE-2026-39358: CubeCart SQL Injection Vulnerability

CVE-2026-39358 Overview

CubeCart is an open-source ecommerce platform used by online merchants to manage storefronts, products, and customer data. CVE-2026-39358 identifies authenticated time-based blind SQL injection vulnerabilities in CubeCart versions prior to 6.6.0. The flaws reside in the sorting parameters sort[price], sort_activity, sort_admin, and sort_customer of the Products and Logs endpoints. Authenticated attackers can execute arbitrary SQL commands against the underlying database. Successful exploitation compromises the confidentiality, integrity, and availability of stored ecommerce data, including order records, customer details, and administrative logs. The vulnerability is fixed in CubeCart 6.6.0.

Critical Impact

Authenticated attackers can extract or modify database contents by injecting SQL through sorting parameters on Products and Logs endpoints in CubeCart v6.x prior to 6.6.0.

Affected Products

• CubeCart v6.x prior to 6.6.0
• CubeCart Products endpoint (sorting parameters)
• CubeCart Logs endpoint (sorting parameters)

Discovery Timeline

• 2026-05-13 - CVE-2026-39358 published to NVD
• 2026-05-13 - Last updated in NVD database

Technical Details for CVE-2026-39358

Vulnerability Analysis

The vulnerability is classified as SQL Injection [CWE-89]. CubeCart accepts sorting parameters on administrative endpoints and incorporates them into SQL queries without adequate sanitization or parameterization. The affected parameters are sort[price], sort_activity, sort_admin, and sort_customer. These parameters appear in the Products listing endpoint and the Logs endpoint of the administrative interface.

Because the injection point is consumed by an ORDER BY clause or similar sorting construct, the application does not return query results directly to the attacker. Exploitation therefore uses a time-based blind technique. The attacker injects conditional SQL expressions that call functions such as SLEEP() to infer database content from response delays.

The vulnerability requires authentication, which limits exploitation to users with valid credentials to the affected administrative interfaces. Once authenticated, the attacker can enumerate database schema, extract credentials and customer records, and modify or delete data.

Root Cause

The root cause is improper neutralization of user-controlled input used in SQL statements. The sorting parameters are concatenated into database queries rather than bound as parameters or validated against an allow-list of permitted column names and sort directions.

Attack Vector

An authenticated attacker submits crafted HTTP requests to the Products or Logs endpoints, supplying malicious SQL payloads in the sort[price], sort_activity, sort_admin, or sort_customer parameters. The payloads use time-delay primitives to perform blind boolean extraction of database contents over successive requests. Refer to the CubeCart GitHub Security Advisory GHSA-8gj6-9fwc-h4gh for additional technical context.

Detection Methods for CVE-2026-39358

Indicators of Compromise

• HTTP requests to Products or Logs endpoints containing SQL keywords such as SLEEP, BENCHMARK, UNION, SELECT, or IF( within the sort[price], sort_activity, sort_admin, or sort_customer parameters.
• Unusually long response times on administrative endpoints, consistent with time-based blind SQL injection probing.
• Repeated authenticated requests from a single session iterating values in sort parameters.

Detection Strategies

• Inspect web server and application logs for sort parameter values that contain SQL syntax or encoded payload markers such as %27, --, or 0x.
• Deploy a web application firewall rule that flags non-alphanumeric content in CubeCart sorting parameters.
• Correlate authenticated administrative sessions with database query latency spikes to identify time-based injection attempts.

Monitoring Recommendations

• Enable verbose query logging on the MySQL or MariaDB instance backing CubeCart and review for unexpected SLEEP or conditional execution patterns.
• Alert on repeated 200-status requests to /admin.php or storefront endpoints exhibiting incrementally varying response times.
• Track administrative account activity for abnormal request volume against Products and Logs views.

How to Mitigate CVE-2026-39358

Immediate Actions Required

• Upgrade CubeCart to version 6.6.0 or later, which contains the official fix.
• Audit administrative user accounts and rotate credentials for any account that may have been used to exploit the vulnerability.
• Review database audit logs for evidence of unauthorized data access or modification preceding the upgrade.

Patch Information

The vulnerability is fixed in CubeCart 6.6.0. Administrators should apply the upgrade following the guidance in the CubeCart GitHub Security Advisory GHSA-8gj6-9fwc-h4gh.

Workarounds

• Restrict access to the CubeCart administrative interface using IP allow-listing or VPN-gated network controls until patching is complete.
• Enforce strong authentication and multi-factor authentication for all administrative accounts to reduce the pool of users able to exploit the flaw.
• Deploy a web application firewall rule that blocks SQL metacharacters in the sort[price], sort_activity, sort_admin, and sort_customer parameters.

# Example WAF rule (ModSecurity) blocking SQL syntax in CubeCart sort parameters
SecRule ARGS:sort_activity|ARGS:sort_admin|ARGS:sort_customer|ARGS:sort[price] \
    "@rx (?i)(sleep|benchmark|union|select|--|;|/\*)" \
    "id:1003958,phase:2,deny,status:403,msg:'CubeCart CVE-2026-39358 SQLi attempt'"