---
id: CVE-2026-40551
title: Multiple BinSoft products perform client-side authentication
summary: >-
  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
  authen…
severity: high
cvss: 8.4
cvssVector: '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'
cwe:
  - CWE-603
vendor: BinSoft
product: mpGabinet
affected:
  - mpGabinet <= 23.12.19
  - mpFirma <= 26.4.9
  - mpFaktura <= 26.4.9
  - mpfirma_erp <= 26.4.9
  - mpSekretariat <= 25.2.4
  - mpPOS <= 25.2.4
  - mpCRM <= 25.2.4
  - mpWarsztat <= 20.4.28
published: '2026-04-28'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T12:17:13.293'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-40551'
references:
  - url: 'https://cert.pl/posts/2026/04/CVE-2026-40550/'
    label: cvd@cert.pl
  - url: 'https://www.binsoft.pl/produkty'
    label: cvd@cert.pl
tags:
  - nvd
  - cve.org
epss: 0.00192
epssPercentile: 0.07963
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-04-28T14:16:07.976794Z'
cvssSource: cna
ingestedAt: '2026-09-30T12:02:58.589Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.