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"cveId": "CVE-2026-9058",
"assignerOrgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
"state": "PUBLISHED",
"assignerShortName": "CERT-PL",
"dateReserved": "2026-05-20T06:36:10.929Z",
"datePublished": "2026-05-25T13:23:09.157Z",
"dateUpdated": "2026-07-23T12:00:31.927Z"
},
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"cna": {
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"orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
"shortName": "CERT-PL",
"dateUpdated": "2026-07-23T12:00:31.927Z"
},
"title": "Improper Certificate Verification in Szafir SDK",
"datePublic": "2026-05-25T06:12:00.000Z",
"problemTypes": [
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"descriptions": [
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"lang": "en",
"cweId": "CWE-637",
"description": "CWE-637 Unnecessary Complexity in Protection Mechanism (Not Using 'Economy of Mechanism')",
"type": "CWE"
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"lang": "en",
"cweId": "CWE-393",
"description": "CWE-393: Return of Wrong Status Code",
"type": "CWE"
}
]
},
{
"descriptions": [
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"lang": "en",
"cweId": "CWE-295",
"description": "CWE-295 Improper Certificate Validation",
"type": "CWE"
}
]
}
],
"impacts": [
{
"capecId": "CAPEC-115",
"descriptions": [
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"lang": "en",
"value": "CAPEC-115 Authentication Bypass"
}
]
}
],
"affected": [
{
"vendor": "Krajowa Izba Rozliczeniowa",
"product": "Szafir SDK",
"versions": [
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"status": "affected",
"version": "0",
"lessThan": "1.8.463.2",
"versionType": "semver"
}
],
"defaultStatus": "unaffected"
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"descriptions": [
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"lang": "en",
"value": "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\".\n\nFor 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\".\n\nThis 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:\n(1) in use-cases other than qualified certificate authentication, or\n(2) if the qualified certificate authentication use-case is not correctly implemented by the integrating application.\n\nThis issue was fixed in version 1.8.463.2.",
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"value": "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."
}
]
}
],
"references": [
{
"url": "https://cert.pl/posts/2026/05/CVE-2026-9058",
"tags": [
"third-party-advisory"
]
},
{
"url": "https://www.elektronicznypodpis.pl/",
"tags": [
"product"
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"value": "GENERAL"
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"attackVector": "NETWORK",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"vulnConfidentialityImpact": "HIGH",
"subConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "HIGH",
"subIntegrityImpact": "NONE",
"vulnAvailabilityImpact": "NONE",
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"Safety": "NOT_DEFINED",
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"valueDensity": "NOT_DEFINED",
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"providerUrgency": "NOT_DEFINED",
"version": "4.0",
"baseSeverity": "CRITICAL",
"baseScore": 9.3,
"vectorString": "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"
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],
"credits": [
{
"lang": "en",
"value": "Michał Leszczyński (icedev.pl)",
"type": "finder"
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"timestamp": "2026-05-26T15:57:55.171237Z",
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