FKIE_CVE-2026-9058

Vulnerability from fkie_nvd - Published: 2026-05-25 14:16 - Updated: 2026-07-23 12:18
Severity
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
Summary
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
cvd@cert.plhttps://cert.pl/posts/2026/05/CVE-2026-9058
cvd@cert.plhttps://www.elektronicznypodpis.pl/
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Szafir SDK",
          "vendor": "Krajowa Izba Rozliczeniowa",
          "versions": [
            {
              "lessThan": "1.8.463.2",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "cvd@cert.pl"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "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."
    },
    {
      "lang": "es",
      "value": "El SDK de Szafir devuelve un c\u00f3digo de estado de \u00e9xito del proceso de verificaci\u00f3n de firma digital criptogr\u00e1fica (es decir, /VerifyingTaskItem/Signature/VerificationResult/Result/@code == 0, \u0027Verificado positivamente\u0027) incluso cuando el estado de confianza del certificado del firmante no pudo establecerse (es decir, /VerifyingTaskItem/Signature/VerificationResult/SigningCertificate/@certificateType == \u0027nondetermined\u0027). Esto provoca que las aplicaciones consumidoras traten incorrectamente la firma como v\u00e1lida a pesar de una cadena de certificados no verificada, lo que permite la omisi\u00f3n de autenticaci\u00f3n y la suplantaci\u00f3n de identidad de usuario.\n\nEste problema se solucion\u00f3 en la versi\u00f3n 463."
    }
  ],
  "id": "CVE-2026-9058",
  "lastModified": "2026-07-23T12:18:52.540",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 9.3,
          "baseSeverity": "CRITICAL",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "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/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",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "cvd@cert.pl",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-9058",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-05-26T15:57:55.171237Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-05-25T14:16:27.977",
  "references": [
    {
      "source": "cvd@cert.pl",
      "url": "https://cert.pl/posts/2026/05/CVE-2026-9058"
    },
    {
      "source": "cvd@cert.pl",
      "url": "https://www.elektronicznypodpis.pl/"
    }
  ],
  "sourceIdentifier": "cvd@cert.pl",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-295"
        },
        {
          "lang": "en",
          "value": "CWE-393"
        },
        {
          "lang": "en",
          "value": "CWE-637"
        }
      ],
      "source": "cvd@cert.pl",
      "type": "Primary"
    }
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.