# CVE-2026-110972: Use of Client-Side Authentication in Płatnik

Status: published. Published: 2026-10-30. Updated: 2026-11-03.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Zakład Ubezpieczeń Społecznych / Płatnik: ≥ 0; ≤ 10.02.002 (affected, custom); unaffected at metric 334. Source: CNA: CERT-PL

## Severity and prioritization

- CVSS 4.0: 8.6 (high); 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; source: CNA: CERT-PL

- CVSS 4.0: 8.6 (high); 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: cvd@cert.pl

- CISA KEV: No listing in collected sources

- EPSS: 0.21% as of 2026-11-02; percentile 10.42%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-603

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://cert.pl/posts/2026/10/CVE-2026-110970 (CNA: CERT-PL; third-party-advisory)

- https://www.zus.pl/firmy/program-platnik/o-programie-platnik (CNA: CERT-PL; product)

- https://cert.pl/posts/2026/10/CVE-2026-110970 (cvd@cert.pl)

- https://www.zus.pl/firmy/program-platnik/o-programie-platnik (cvd@cert.pl)

## Provenance

- CNA: CERT-PL: https://www.cve.org/CVERecord?id=CVE-2026-110972; retrieved 2026-11-03; source updated 2026-11-03

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-110972; retrieved 2026-11-03; source updated 2026-11-03

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-110972; retrieved 2026-11-03; source updated Not reported

Revision: 199d8b1e5707680fb9e6551eeb9e236f10890e5553484a4eabd3bcb8d0c1ae2f

Canonical: https://y2.dev/cve/CVE-2026-110972

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.