FreeRDP shadow before 3.32.0 Pre-Authentication Input Injection via Confirm Active bypass

{
  "id": "3aaa47c96dc8ce41099666e2d87c1935b8c579967f323190a50f5b0c1aafac60",
  "url": "https://osv.dev/vulnerability/CVE-2026-110838",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "FreeRDP shadow before 3.32.0 Pre-Authentication Input Injection via Confirm Active bypass",
    "summary": "FreeRDP shadow server from 3.0.0 before 3.32.0 dispatches input PDUs during the Confirm Active state before authentication, allowing unauthenticated attackers to inject keyboard input. Attackers can negotiate TLS-only RDP and send an input PDU without Confirm Active to inject synthetic keystrokes into the host user's X11 session via XTEST.",
    "evidence": "osv:CVE-2026-110838",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-110838",
      "aliases": [
        "CVE-2026-110838",
        "GHSA-m998-cvfm-9444"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/freerdp/freerdp",
              "type": "GIT",
              "events": [
                {
                  "introduced": "a34fa7c49d2a39aa49ace1d7bea9656912d8c7cb"
                },
                {
                  "fixed": "d27a4f7c1c63b62a5e60e5d939ad116cfb58ffc1"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "3.0.0"
                      },
                      {
                        "fixed": "3.32.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "cpe": "cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.0.0"
                      },
                      {
                        "fixed": "3.32.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "3.5.1",
            "3.5.0",
            "3.4.0",
            "3.3.0",
            "3.2.0",
            "3.1.0",
            "3.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-110838.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:28.196506996Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110838.json",
        "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-m998-cvfm-9444",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-110838",
        "https://www.vulncheck.com/advisories/freerdp-shadow-before-3.32.0-pre-authentication-input-injection-via-confirm-active-bypass"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-306"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110838.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-110838",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 494959,
  "published_at": "2026-10-14T22:52:13.434+00:00"
}