CVE-2026-110972
Received Received - Intake

Płatnik Client-Side Authentication Bypass Vulnerability

Publication date: 2026-10-30

Last updated on: 2026-10-30

Assigner: CERT.PL

Description
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 242 in version 10.02.002.

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Meta Information

Published
2026-10-30
Last Modified
2026-10-30
Generated
2026-10-30
AI Q&A
2026-10-30
EPSS Evaluated
N/A
NVD
CVE-2026-110972
EUVD
EUVD-2026-113776

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
Zakład Ubezpieczeń Społecznych Płatnik 0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-603 A client/server product performs authentication within client code but not in server code, allowing server-side authentication to be bypassed via a modified client that omits the authentication check.

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Executive Summary

Płatnik has a client-side authentication flaw where an attacker with access to any application instance connected to the backend server can bypass login verification and authenticate as any user without proper credentials.

Impact Analysis

An attacker could gain unauthorized access to sensitive data or perform actions on behalf of other users, leading to data breaches, fraud, or system misuse. The impact depends on the privileges of the impersonated accounts.

Compliance Impact

This vulnerability could lead to unauthorized access to personal or sensitive data, violating GDPR (data protection) and HIPAA (health information privacy) requirements for access controls and data security.

Mitigation Strategies

Update Płatnik to version 10.02.002 or later to address the client-side authentication bypass issue.

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