Vulnerability · Published Apr 28, 2026 · Assigned by CERT-PL

CVE-2026-40551Use of Client-Side Authentication in multiple BinSoft products

High 8.4

In plain English

A high-severity security flaw in mpCRM from BinSoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities).

Severity (CVSS 4.0)8.4High

Exploit odds (30 days)0.1%top 97.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
BinSoft	mpGabinet	0 – through 23.12.19
BinSoft	mpFirma	0 – through 26.4.9
BinSoft	mpFaktura	0 – through 26.4.9
BinSoft	mpFirma ERP	0 – through 26.4.9
BinSoft	mpSekretariat	0 – through 25.2.4
BinSoft	mpPOS	0 – through 25.2.4
BinSoft	mpCRM	0 – through 25.2.4
BinSoft	mpWarsztat	0 – through 20.4.28

Weakness: CWE-603 · Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N

References

https://cert.pl/posts/2026/04/CVE-2026-40550/ third-party-advisory
https://www.binsoft.pl/produkty product