{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-4349",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-18T19:59:03.230542Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-18T19:59:09.789Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "modules": [
            "Token Renewal Endpoint"
          ],
          "product": "IdentityServer4",
          "vendor": "Duende",
          "versions": [
            {
              "status": "affected",
              "version": "4.1.0"
            },
            {
              "status": "affected",
              "version": "4.1.1"
            },
            {
              "status": "affected",
              "version": "4.1.2"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "Edcarlos (VulDB User)"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "VulDB"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A vulnerability was determined in Duende IdentityServer4 up to 4.1.2. The affected element is an unknown function of the file /connect/authorize of the component Token Renewal Endpoint. This manipulation of the argument id_token_hint causes improper authentication. It is possible to initiate the attack remotely. The attack is considered to have high complexity. The exploitability is described as difficult. This vulnerability only affects products that are no longer supported by the maintainer."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "baseScore": 6.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X",
            "version": "4.0"
          }
        },
        {
          "cvssV3_1": {
            "baseScore": 5.6,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:X/RC:X",
            "version": "3.1"
          }
        },
        {
          "cvssV3_0": {
            "baseScore": 5.6,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:X/RC:X",
            "version": "3.0"
          }
        },
        {
          "cvssV2_0": {
            "baseScore": 5.1,
            "vectorString": "AV:N/AC:H/Au:N/C:P/I:P/A:P/E:ND/RL:ND/RC:ND",
            "version": "2.0"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-287",
              "description": "Improper Authentication",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-25T10:56:05.955Z",
        "orgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
        "shortName": "VulDB"
      },
      "references": [
        {
          "name": "VDB-351380 | Duende IdentityServer4 Token Renewal Endpoint authorize improper authentication",
          "tags": [
            "vdb-entry",
            "technical-description"
          ],
          "url": "https://vuldb.com/?id.351380"
        },
        {
          "name": "VDB-351380 | CTI Indicators (IOB, IOC, IOA)",
          "tags": [
            "signature",
            "permissions-required"
          ],
          "url": "https://vuldb.com/?ctiid.351380"
        },
        {
          "name": "Submit #772071 | DuendeSoftware Identity Server 4 Authentication Bypass Issues",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://vuldb.com/?submit.772071"
        }
      ],
      "tags": [
        "unsupported-when-assigned"
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-03-17T00:00:00.000Z",
          "value": "Advisory disclosed"
        },
        {
          "lang": "en",
          "time": "2026-03-17T01:00:00.000Z",
          "value": "VulDB entry created"
        },
        {
          "lang": "en",
          "time": "2026-03-25T12:00:53.000Z",
          "value": "VulDB entry last update"
        }
      ],
      "title": "Duende IdentityServer4 Token Renewal Endpoint authorize improper authentication"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
    "assignerShortName": "VulDB",
    "cveId": "CVE-2026-4349",
    "datePublished": "2026-03-17T21:32:11.670Z",
    "dateReserved": "2026-03-17T17:03:17.392Z",
    "dateUpdated": "2026-03-25T10:56:05.955Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}