# CVE-2026-9058

## Summary

- **CVE ID:** CVE-2026-9058
- **Severity:** CRITICAL
- **CVSS Score:** 9.3 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-637, CWE-393, CWE-295
- **Published:** May 25, 2026
- **Last Modified:** Jul 24, 2026

## Description

Szafir SDK returns a success status code from the cryptographic digital signature verification process (i.e. /VerifyingTaskItem/Signature/VerificationResult/Result/@code == 0, "Positively verified") even when the trust status of the signer's certificate could not be established (i.e. /VerifyingTaskItem/Signature/VerificationResult/SigningCertificate/@certificateType == "nondetermined"). This causes consuming applications to incorrectly treat the signature as valid despite an unverified certificate chain, enabling authentication bypass and user impersonation.

This issue was fixed in version 463.

## Affected Products

- Krajowa Izba Rozliczeniowa — Szafir SDK (0)

## References

- [CNA](https://cert.pl/posts/2026/05/CVE-2026-9058)
- [CNA](https://www.elektronicznypodpis.pl/)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.31%
- **EPSS Percentile:** 23.4

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._