Vulnerability · Published Oct 30, 2026 · Assigned by CERT-PL
CVE-2026-110972Use of Client-Side Authentication in Płatnik
High 8.6
In plain English
A high-severity security flaw in Płatnik from Zakład Ubezpieczeń Społecznych. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities).
Severity (CVSS 4.0)8.6High
Exploit odds (30 days)0.2%top 89.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 334 in version 10.02.002.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Zakład Ubezpieczeń Społecznych | Płatnik | 0 – through 10.02.002 |
Weakness: CWE-603 · Vector: 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
References
- https://cert.pl/posts/2026/10/CVE-2026-110970 third-party-advisory
- https://www.zus.pl/firmy/program-platnik/o-programie-platnik product