CVE-2026-40551 Use of Client-Side Authentication in multiple BinSoft products
Attackers can bypass login verification by manipulating the application binary to authenticate as arbitrary users in BinSoft products.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-40551?
CVE-2026-40551 is a high-severity authentication bypass vulnerability in BinSoft mpCRM, published on 28 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Multiple BinSoft products perform client-side authentication. An attacker with access to any application instance connected to the backend server can bypass the login verification process by manipulating the application binary and authenticate as an arbitrary user.
The described issue affects all published versions. The vendor stated that this issue is a direct result of the architecture model in which the software is distributed, and that it will be mitigated with a corrected installation manual.
Weakness: CWE-603
Which versions are affected by CVE-2026-40551?
How do I fix CVE-2026-40551?
No fix has been published for CVE-2026-40551 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-40551 being exploited?
There is no known exploitation of CVE-2026-40551 in the wild and no public exploit code.
Sources
Also known as GHSA-4r5q-f55r-9frx.