---
id: CVE-2026-110972
title: Use of Client-Side Authentication in Płatnik
summary: "Płatnik performs client-side authentication. An attacker with access to any application instance connected to the backend server can bypass the login verification process and authenticate as an arbitrary user.\n\n\n\nThis issue was fixed\_in …"
severity: high
cvss: 8.6
cvssVector: 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-603
vendor: Zakład Ubezpieczeń Społecznych
product: Płatnik
affected:
  - Płatnik <= 10.02.002
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-30T15:26:06.783259Z'
published: '2026-10-30'
updated: '2026-11-03'
sourceUpdated: '2026-11-03T09:13:32.724Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-110972'
references:
  - url: 'https://cert.pl/posts/2026/10/CVE-2026-110970'
  - url: 'https://www.zus.pl/firmy/program-platnik/o-programie-platnik'
tags:
  - cve.org
epss: 0.00205
epssPercentile: 0.10491
ingestedAt: '2026-11-05T19:30:42.935Z'
---

## Overview

Płatnik performs client-side authentication. An attacker with access to any application instance connected to the backend server can bypass the login verification process and authenticate as an arbitrary user.



This issue was fixed in metric 334 in version 10.02.002.

## Affected

- `Płatnik <= 10.02.002`

## Remediation

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