FKIE_CVE-2026-117470

Vulnerability from fkie_nvd - Published: 2026-10-27 06:17 - Updated: 2026-10-27 15:00
Severity
6.5 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
Summary
Psono Server CE & EE versions 3.1.0 through 7.2.3 did not consume a stored WebAuthn challenge after assertion verification. An unauthenticated remote attacker who possessed the user's password and one captured valid WebAuthn assertion could replay that assertion with separate login tokens while the stored challenge remained unchanged, bypassing the WebAuthn second factor. The attack required capture of a valid assertion and did not itself disclose plaintext secrets.
References
fdf66990-8419-4c8c-8848-ec15d75773b4https://gitlab.com/esaqa/esaqa/security-advisories/-/blob/master/advisories/CVE-2026-117470.md
fdf66990-8419-4c8c-8848-ec15d75773b4https://gitlab.com/esaqa/psono/psono-server
fdf66990-8419-4c8c-8848-ec15d75773b4https://gitlab.com/esaqa/psono/psono-server/-/blob/v7.2.3/psono/restapi/serializers/webauthn_verify.py
fdf66990-8419-4c8c-8848-ec15d75773b4https://gitlab.com/esaqa/psono/psono-server/-/commit/9c9a7f1701535df63370340dcc80210737dc495d
fdf66990-8419-4c8c-8848-ec15d75773b4https://gitlab.com/esaqa/psono/psono-server/-/releases/v7.2.4
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "modules": [
            "Psono Server Community Edition",
            "Psono Server Enterprise Edition"
          ],
          "product": "Psono",
          "programFiles": [
            "psono/restapi/serializers/webauthn_verify.py"
          ],
          "repo": "https://gitlab.com/esaqa/psono/psono-server",
          "vendor": "esaqa GmbH",
          "versions": [
            {
              "lessThan": "7.2.4",
              "status": "affected",
              "version": "3.1.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "fdf66990-8419-4c8c-8848-ec15d75773b4"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Psono Server CE \u0026 EE versions 3.1.0 through 7.2.3 did not consume a stored WebAuthn challenge after assertion verification. An unauthenticated remote attacker who possessed the user\u0027s password and one captured valid WebAuthn assertion could replay that assertion with separate login tokens while the stored challenge remained unchanged, bypassing the WebAuthn second factor. The attack required capture of a valid assertion and did not itself disclose plaintext secrets."
    }
  ],
  "id": "CVE-2026-117470",
  "lastModified": "2026-10-27T15:00:49.240",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 4.2,
        "source": "fdf66990-8419-4c8c-8848-ec15d75773b4",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-10-27T06:17:24.867",
  "references": [
    {
      "source": "fdf66990-8419-4c8c-8848-ec15d75773b4",
      "url": "https://gitlab.com/esaqa/esaqa/security-advisories/-/blob/master/advisories/CVE-2026-117470.md"
    },
    {
      "source": "fdf66990-8419-4c8c-8848-ec15d75773b4",
      "url": "https://gitlab.com/esaqa/psono/psono-server"
    },
    {
      "source": "fdf66990-8419-4c8c-8848-ec15d75773b4",
      "url": "https://gitlab.com/esaqa/psono/psono-server/-/blob/v7.2.3/psono/restapi/serializers/webauthn_verify.py"
    },
    {
      "source": "fdf66990-8419-4c8c-8848-ec15d75773b4",
      "url": "https://gitlab.com/esaqa/psono/psono-server/-/commit/9c9a7f1701535df63370340dcc80210737dc495d"
    },
    {
      "source": "fdf66990-8419-4c8c-8848-ec15d75773b4",
      "url": "https://gitlab.com/esaqa/psono/psono-server/-/releases/v7.2.4"
    }
  ],
  "sourceIdentifier": "fdf66990-8419-4c8c-8848-ec15d75773b4",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-294"
        }
      ],
      "source": "fdf66990-8419-4c8c-8848-ec15d75773b4",
      "type": "Secondary"
    }
  ]
}



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