CVE-2026-40837: Unauthenticated SQL Injection Vulnerability

CVE-2026-40837 Overview

CVE-2026-40837 is a SQL Injection vulnerability [CWE-89] affecting the getProjectScalings function. The flaw stems from improper neutralization of special elements within a SQL SELECT command. A low-privileged remote attacker can exploit the issue over the network without user interaction. Successful exploitation results in a total loss of confidentiality of data accessible through the affected database. The vulnerability was disclosed through a CERT-VDE security advisory and assigned a CVSS 4.0 base score of 7.1. While the original description references the flaw as unauthenticated, the CVSS vector indicates low privileges are required, suggesting authenticated low-tier accounts can trigger the injection.

Critical Impact
Remote attackers with low privileges can extract sensitive database contents by injecting crafted SQL fragments into the getProjectScalings function, leading to full confidentiality loss.

Affected Products

Product details disclosed in the CERT-VDE Security Advisory VDE-2026-044
Specific vendor and product identifiers are not enumerated in the NVD record
Affected component: getProjectScalings function

Discovery Timeline

2026-05-27 - CVE-2026-40837 published to NVD
2026-05-27 - Last updated in NVD database

Technical Details for CVE-2026-40837

Vulnerability Analysis

The vulnerability resides in the getProjectScalings function, which constructs a SQL SELECT statement using attacker-controllable input. The function fails to neutralize special SQL metacharacters before concatenating them into the query string. As a result, injected payloads alter the structure of the executed query. The flaw is classified under [CWE-89], Improper Neutralization of Special Elements used in an SQL Command. The CVSS 4.0 vector reports high impact on confidentiality with no impact on integrity or availability, indicating the injection enables read-oriented attacks such as UNION-based or boolean-blind data extraction rather than write operations.

Root Cause

The root cause is the absence of parameterized queries or proper input sanitization within getProjectScalings. User-supplied values flow directly into the SQL statement without binding or escaping. This allows specially crafted strings to terminate the intended query context and append attacker-defined SQL syntax.

Attack Vector

The attack vector is network-based. An attacker authenticates with low-privileged credentials and submits a malicious request to the endpoint that invokes getProjectScalings. The injected SQL is executed by the backend database. The attacker can then enumerate tables, extract credentials, and harvest configuration or project data accessible to the application's database user. No user interaction is required, and attack complexity is rated low. Refer to the CERT-VDE Security Advisory for technical specifics.

Detection Methods for CVE-2026-40837

Indicators of Compromise

Application or database logs showing SQL syntax characters such as ', --, UNION SELECT, or INFORMATION_SCHEMA references in requests to endpoints invoking getProjectScalings
Unusually large result sets or repeated queries targeting metadata tables from the application's database account
Authenticated sessions from low-privileged accounts generating database errors or anomalous query patterns

Detection Strategies

Inspect web server and application logs for parameters passed to getProjectScalings that contain SQL control characters or encoded variants
Enable database query auditing to identify queries deviating from the application's expected statement templates
Deploy a Web Application Firewall with SQL injection signatures tuned for the affected endpoint

Monitoring Recommendations

Forward application and database telemetry to a centralized SIEM for correlation of suspicious query patterns with authentication events
Alert on database errors originating from the application context, which often accompany injection probing
Monitor for spikes in outbound data volume from the database server that may indicate bulk extraction

How to Mitigate CVE-2026-40837

Immediate Actions Required

Apply the vendor patch referenced in the CERT-VDE Security Advisory VDE-2026-044 as soon as it is available for your deployment
Restrict network access to the affected application to trusted management networks until the patch is applied
Audit low-privileged accounts and rotate credentials suspected of misuse

Patch Information

Patch availability and fixed version details are published in the CERT-VDE Security Advisory VDE-2026-044. Administrators should consult the advisory for vendor-specific update procedures and verify the deployed build after upgrade.

Workarounds

Place the affected service behind a Web Application Firewall configured with SQL injection rules targeting the getProjectScalings endpoint
Enforce least-privilege on the database account used by the application so that injection cannot reach sensitive tables
Disable or block access to the vulnerable endpoint where business workflows allow

bash

# Example WAF rule concept for blocking SQLi tokens on the affected endpoint
# Replace placeholders with your WAF syntax and the real endpoint path
SecRule REQUEST_URI "@contains /getProjectScalings" \
  "phase:2,deny,status:403,\
   chain,msg:'CVE-2026-40837 SQLi attempt'"
  SecRule ARGS "@rx (?i)(union\s+select|--|;|/\*|information_schema)"