Which versions of mbCONNECT24 are affected by CVE-2026-40819?

mbCONNECT24 and related remote-maintenance portals (version 2.20.0 and earlier) expose complete database confidentiality to any network-reachable attacker through an unauthenticated SQL injection…

How to fix or mitigate CVE-2026-40819?

Within 24 hours: restrict network access to mbCONNECT24/myREX24V2 to known administrative IP addresses; segment affected systems from general networks; contact the platform vendor for patch availability timeline. Within 7 days: deploy Web Application Firewall (WAF) with SQL injection signatures targeting the 'sync_data24' task; enable input validation; implement database activity monitoring (DAM) with alerting for SQL injection patterns. Within 30 days: upgrade to patched version when vendor releases version >2.20.0; conduct full database access audit; review and revoke unauthorized access tokens.

mbCONNECT24 CVE-2026-40819

Q: What is the CVSS score of CVE-2026-40819?

CVE-2026-40819 has a CVSS 4.0 base score of 8.7 (High). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.0%.

EUVD-2026-32124 HIGH

SQL Injection (CWE-89)

2026-05-27 info@cert.vde.com

GHSA-jq3h-5mgm-m888

SQLi

8.7

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

8.7 HIGH

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Lifecycle Timeline

Analysis Generated

May 27, 2026 - 20:01 vuln.today

DescriptionCVE.org

An unauthenticated remote attacker can exploit an unauthenticated SQL Injection vulnerability in the sync_data24 task due to improper neutralization of special elements in a SQL SELECT command. This can result in a total loss of confidentiality.

AnalysisAI

Unauthenticated SQL injection in the mbCONNECT24 remote-maintenance platform (and the related myREX24V2, myREX24V2.virtual, and mymbCONNECT24 portals) at version 2.20.0 and earlier lets a remote attacker inject crafted SQL into a SELECT statement processed by the 'sync_data24' task, yielding a total loss of database confidentiality (CVSS 4.0 base 8.7). Because the CVSS vector confirms no privileges and no user interaction (PR:N/UI:N), any network-reachable client can attempt it. There is no public exploit identified at time of analysis, and the EPSS score is very low (0.05%, 15th percentile), so widespread automated exploitation is not currently indicated.

Technical ContextAI

The affected software is a family of cloud and industrial remote-access/remote-maintenance portals from MB connect line (Red Lion) - mbCONNECT24, mymbCONNECT24, and the myREX24V2 variants including the .virtual edition - typically used to broker VPN and remote service connections to industrial (OT/ICS) equipment, which is consistent with the report originating from CERT@VDE. The flaw is classified as CWE-89 (Improper Neutralization of Special Elements used in an SQL Command). The 'sync_data24' task constructs a SQL SELECT query that incorporates attacker-controllable input without proper escaping or parameterization, so injected SQL syntax is executed by the backend database. The impact profile (VC:H, VI:N, VA:N) indicates a read-oriented injection allowing data disclosure rather than data modification or service disruption.

RemediationAI

Upgrade to a vendor-fixed release beyond 2.20.0 as directed by VDE advisory VDE-2026-044 (https://www.certvde.com/en/advisories/VDE-2026-044/); the exact fixed version number is not present in the available data, so confirm it from that advisory before deploying. Until patched, reduce exposure of the remote-access portal by restricting network reachability of the management/portal interface to trusted source IPs via firewall or VPN allow-listing rather than leaving it internet-facing - this limits who can reach the vulnerable sync_data24 task, at the cost of blocking remote operators not on the allow-list. If the platform sits behind a web application firewall or reverse proxy, deploy SQLi-detection rules targeting the sync_data24 request parameters, accepting that signature-based filtering can be bypassed and may generate false positives. As a detective control, monitor database and application logs for anomalous SELECT activity originating from the sync task.