Vulnerability-Lookup

GHSA-3GQ2-HX4P-69QC

Vulnerability from github – Published: 2026-10-27 06:31 – Updated: 2026-10-27 06:31

Details

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.

Severity

6.5 (Medium)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N

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{
  "affected": [],
  "aliases": [
    "CVE-2026-117470"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-294"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-27T06:17:24Z",
    "severity": "MODERATE"
  },
  "details": "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": "GHSA-3gq2-hx4p-69qc",
  "modified": "2026-10-27T06:31:23Z",
  "published": "2026-10-27T06:31:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-117470"
    },
    {
      "type": "WEB",
      "url": "https://gitlab.com/esaqa/esaqa/security-advisories/-/blob/master/advisories/CVE-2026-117470.md"
    },
    {
      "type": "WEB",
      "url": "https://gitlab.com/esaqa/psono/psono-server"
    },
    {
      "type": "WEB",
      "url": "https://gitlab.com/esaqa/psono/psono-server/-/blob/v7.2.3/psono/restapi/serializers/webauthn_verify.py"
    },
    {
      "type": "WEB",
      "url": "https://gitlab.com/esaqa/psono/psono-server/-/commit/9c9a7f1701535df63370340dcc80210737dc495d"
    },
    {
      "type": "WEB",
      "url": "https://gitlab.com/esaqa/psono/psono-server/-/releases/v7.2.4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-117470 (GCVE-0-2026-117470)

Vulnerability from cvelistv5 – Published: 2026-10-27 05:53 – Updated: 2026-10-27 05:53

Title

WebAuthn assertion replay permits second-factor bypass in Psono Server

Summary

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N

CWE

CWE-294 - Authentication Bypass by Capture-replay

Assigner

esaqa CNA under the ENISA root

CNA scorecard – unranked: 5 records in the last 180 days, 10 needed details

References

5 references

URL	Tags
https://gitlab.com/esaqa/esaqa/security-advisorie…	vendor-advisory
https://gitlab.com/esaqa/psono/psono-server/-/blo…	technical-description
https://gitlab.com/esaqa/psono/psono-server/-/com…	patch
https://gitlab.com/esaqa/psono/psono-server/-/rel…	release-notes
https://gitlab.com/esaqa/psono/psono-server	product

Impacted products

1 product

Vendor	Product	Version
esaqa GmbH	Psono	Affected: 3.1.0 , < 7.2.4 (semver)

Date Public

2026-10-27 00:00

Credits

Ryan Chaplin

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "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"
            }
          ]
        }
      ],
      "credits": [
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          "lang": "en",
          "type": "finder",
          "value": "Ryan Chaplin"
        }
      ],
      "datePublic": "2026-10-27T00:00:00.000Z",
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              "base64": false,
              "type": "text/html",
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            }
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        }
      ],
      "impacts": [
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          "descriptions": [
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              "lang": "en",
              "value": "An attacker with a user\u0027s password and one captured valid WebAuthn assertion could replay the assertion to bypass the WebAuthn second factor and gain account access."
            }
          ]
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      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
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        "orgId": "fdf66990-8419-4c8c-8848-ec15d75773b4",
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          "tags": [
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          "url": "https://gitlab.com/esaqa/psono/psono-server/-/commit/9c9a7f1701535df63370340dcc80210737dc495d"
        },
        {
          "tags": [
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          ],
          "url": "https://gitlab.com/esaqa/psono/psono-server/-/releases/v7.2.4"
        },
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          "tags": [
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          "url": "https://gitlab.com/esaqa/psono/psono-server"
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            }
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          "time": "2026-07-30T07:49:00.000Z",
          "value": "Vendor fix implemented"
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          "time": "2026-07-30T13:16:00.000Z",
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    "dateReserved": "2026-10-27T05:33:18.001Z",
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    "state": "PUBLISHED"
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  "dataVersion": "5.2"
}

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.

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
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