CVE-2026-40819: sync_data24 Task SQLi Vulnerability

CVE-2026-40819 Overview

CVE-2026-40819 is an unauthenticated SQL injection vulnerability [CWE-89] in the sync_data24 task. The flaw stems from improper neutralization of special elements in a SQL SELECT command. A remote attacker can exploit the issue over the network without authentication or user interaction. Successful exploitation results in a total loss of confidentiality of database contents. The vulnerability was disclosed through CERT VDE advisory VDE-2026-044.

Critical Impact
Unauthenticated remote attackers can extract sensitive database contents by injecting crafted input into the sync_data24 task, leading to complete confidentiality loss.

Affected Products

Affected product details published in CERT VDE Advisory VDE-2026-044
Specific vendor and product entries are not enumerated in the NVD record at publication time
Refer to the CERT VDE advisory for the authoritative list of affected versions

Discovery Timeline

2026-05-27 - CVE-2026-40819 published to NVD
2026-05-27 - Last updated in NVD database

Technical Details for CVE-2026-40819

Vulnerability Analysis

The vulnerability resides in the sync_data24 task, which processes data through a SQL SELECT statement. The task fails to neutralize special characters supplied in attacker-controlled input before concatenating them into the query. This allows an attacker to break out of the intended query context and append arbitrary SQL syntax. Because the task is reachable without authentication, the attack surface includes any network-accessible instance.

The weakness maps to [CWE-89]: Improper Neutralization of Special Elements used in an SQL Command. The scope of impact is limited to confidentiality, with no integrity or availability consequences listed in the CVSS metrics. Attackers can read arbitrary records from the backing database, including credentials, configuration, and stored process data.

Root Cause

The root cause is the construction of a SQL SELECT statement using untrusted input without parameterized queries or input sanitization. The sync_data24 handler accepts external data and inserts it directly into the query string. This pattern enables classic in-band and inferential SQL injection techniques against the underlying database.

Attack Vector

The attack vector is network-based and requires no privileges or user interaction. An attacker sends crafted requests to the endpoint that triggers the sync_data24 task. By embedding SQL meta-characters such as single quotes, comment markers, and UNION clauses, the attacker manipulates query logic. The response or observable side effects allow extraction of arbitrary data from the database.

No verified public proof-of-concept code is referenced in the NVD record. Technical details are available in the CERT VDE Advisory VDE-2026-044.

Detection Methods for CVE-2026-40819

Indicators of Compromise

HTTP or application-layer requests targeting the sync_data24 endpoint containing SQL meta-characters such as ', --, ;, UNION SELECT, or OR 1=1
Anomalous outbound database query volume originating from the application service account
Application or database error messages referencing malformed SQL syntax tied to sync_data24
Unexpected SELECT queries against sensitive tables outside normal application workflows

Detection Strategies

Deploy web application firewall (WAF) rules that flag SQL injection patterns aimed at the sync_data24 task path
Enable database query logging and alert on queries containing concatenated user input or tautology patterns
Correlate application access logs with database audit logs to identify unauthenticated request chains reaching sensitive tables
Hunt for repeated requests with incremental payload variations indicative of automated SQLi tooling such as sqlmap

Monitoring Recommendations

Monitor authentication-free endpoints for spikes in request volume or payload entropy
Capture and review full request bodies for the sync_data24 task during the exposure window
Track database read volumes per service account and alert on deviations from baseline
Forward application, WAF, and database telemetry to a central analytics platform for cross-source correlation

How to Mitigate CVE-2026-40819

Immediate Actions Required

Review the CERT VDE Advisory VDE-2026-044 to identify affected versions in your environment
Restrict network access to the vulnerable service so only trusted management networks can reach the sync_data24 endpoint
Enable database query auditing on accounts used by the affected application to capture exploitation evidence
Inventory and rotate any secrets that may have been exposed if exploitation is suspected

Patch Information

Vendor patch details and fixed versions are published in the CERT VDE Advisory VDE-2026-044. Apply the vendor-provided update as soon as it is available for your platform. Validate the patched build in a staging environment before broad rollout, and confirm that the sync_data24 task uses parameterized queries after upgrade.

Workarounds

Block external access to the sync_data24 endpoint using network ACLs or firewall rules until patches are applied
Place a WAF in front of the application with SQL injection signatures tuned for SELECT payloads
Apply least-privilege permissions to the database account used by the application to limit data exposure if exploited
Disable the affected task or service if it is not required for production operations

bash

# Example firewall restriction limiting access to the affected service
iptables -A INPUT -p tcp --dport <service-port> -s <trusted-management-cidr> -j ACCEPT
iptables -A INPUT -p tcp --dport <service-port> -j DROP