AVideo LoginControl PGP Authentication Bypass via verifyChallenge

{
  "id": "b898509fb86e0eb8ef9e7bfca597cd213abfc331d3f7a8228e1be42dd33073d9",
  "url": "https://osv.dev/vulnerability/CVE-2026-86723",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "AVideo LoginControl PGP Authentication Bypass via verifyChallenge",
    "summary": "AVideo through c3edcc274c389816d434acadac07ee78eaf330c1 contains an authentication bypass vulnerability in LoginControl::verifyChallenge() that uses loose comparison (==) instead of strict comparison (===) against unset session values. Attackers with only a password can submit an empty request to verifyChallenge.json.php to bypass PGP two-factor authentication and gain full authenticated access.",
    "evidence": "osv:CVE-2026-86723",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-86723",
      "aliases": [
        "CVE-2026-86723",
        "GHSA-vmpj-f3mf-q4j2"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/wwbn/avideo",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "c3edcc274c389816d434acadac07ee78eaf330c1"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "c3edcc274c389816d434acadac07ee78eaf330c1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
          ],
          "versions": [
            "29.0",
            "26.0",
            "25.0",
            "24.0",
            "22.0",
            "21.0",
            "18.0",
            "14.3.1",
            "14.3",
            "12.4",
            "11.6",
            "11.5",
            "11.1.1",
            "11.1",
            "11",
            "10.8",
            "8.9.1",
            "8.9",
            "8.7",
            "8.6",
            "8.5",
            "8.1",
            "7.8",
            "7.7",
            "7.6",
            "7.4",
            "7.3",
            "7.2",
            "4.0",
            "3.4",
            "2.7",
            "2.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-86723.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:31.646644909Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86723.json",
        "https://github.com/WWBN/AVideo/security/advisories/GHSA-vmpj-f3mf-q4j2",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-86723",
        "https://www.vulncheck.com/advisories/avideo-logincontrol-pgp-authentication-bypass-via-verifychallenge"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-287"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86723.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-86723",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 498621,
  "published_at": "2026-09-08T15:13:56.176+00:00"
}