CVE-2026-9058

CRITICAL EPSS 22.3%

Published May 25, 20261mo ago · Modified Jun 17, 20262w ago

9.3 CVSS 4.0

Critical

Published May 25, 2026 1mo ago

Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score

9.3

Exploitability

—

Impact

—

Vector string

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/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

Attack Vector Network

Attack Complexity Low

Privileges Required None

User Interaction None

Scope X

Threat Intelligence

EPSS Exploit Probability

22.3% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 2

CWE-393

CWE-637

References 2

cert.pl https://cert.pl/posts/2026/05/CVE-2026-9058
elektronicznypodpis.pl https://www.elektronicznypodpis.pl/

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.