CVE-2026-40836 Authenticated SQLi in inmessage model
A remote attacker can exploit SQL injection to read the entire database and delete entries in specific tables of the mbCONNECT24 platform.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-40836?
CVE-2026-40836 is a high-severity SQL injection vulnerability in Helmholz mbCONNECT24, published on 27 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
An low privileged remote attacker can exploit an unauthenticated SQL Injection vulnerability in the inmessage model due to improper neutralization of special elements in a SQL DELETE command allowing for reading the whole database and deleting entries in a non critical table. This can result in a total loss of confidentiality and some loss of integrity.
Weakness: CWE-89
Which versions are affected by CVE-2026-40836?
How do I fix CVE-2026-40836?
No fix has been published for CVE-2026-40836 yet. Limit exposure of the affected software until one is available.
Use parameterised queries everywhere and never build SQL by joining strings. Upgrade affected software first; a web application firewall only buys time. More about SQL injection.
Is CVE-2026-40836 being exploited?
There is no known exploitation of CVE-2026-40836 in the wild and no public exploit code.
Sources
Also known as GHSA-9jg5-m477-mh8r.