CVE-2026-9058
Improper Certificate Verification in Szafir SDK
- State
- Published
- Severity
- 9.3 Critical
- Published
- May 25, 2026
- Updated
- Jul 23, 2026
- Reserved
- May 20, 2026
Description
For untrusted certificates that contain the "Authority Information Access - caIssuers URI" extension, Szafir SDK will automatically download the parent CA certificate from the specified URL and will import it to its trust store as a "nonqualified" certificate. In such a case, Szafir SDK returns a success status code of 0 ("Positively verified") upon successful cryptographic verification and a certificate status of "nonqualified".
For other types of untrusted certificates, Szafir SDK returns a success status code of 0 ("Positively verified") upon successful cryptographic verification and a certificate status of "nondetermined".
This may lead integrating applications to incorrectly treat the digital signature as valid despite an untrusted certificate chain. This flaw enables authentication bypass and user impersonation: (1) in use-cases other than qualified certificate authentication, or (2) if the qualified certificate authentication use-case is not correctly implemented by the integrating application.
This issue was fixed in version 1.8.463.2.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.3 Critical | 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 | CERT-PL |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
Szafir SDKKrajowa Izba Rozliczeniowa |
|
References
- https://cert.pl/posts/2026/05/CVE-2026-9058third-party-advisory
- https://www.elektronicznypodpis.pl/product
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