CVE-2026-107449

Status: DeferredLow (3.4)—

linuxserver Heimdall through 2.8.3 applies its SafeUrlFetcher SSRF protection mechanism only to ItemController; the enhanced-application test and live-stats requests occur via SupportedApps::execute(), a GuzzleHttp client that lacks IP address restrictions. In some realistic installations, the POST /test_config (and GET /get_stats) endpoints are accessible through CSRF, and thus an unauthenticated attacker can force the server to send requests to arbitrary internal hosts and ports (including 169.254.169.254) and read a status/port oracle in addition to partial response data.

CVSS

Version: 3.1
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N
Base score: 3.4

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.16%
Percentile among all scored CVEs: 5
Score date: 10/13/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1203 Exploitation for Client Executionexecution75 %
Primary impactT1090 Proxycommand and control85 %
Secondary impactT1552 Unsecured Credentialscredential access70 %

UI:R requiere interacción del usuario (CSRF); T1090 por SSRF explícito sin restricciones IP; T1552 por lectura de datos de hosts internos (169.254.169.254).

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Filter Network Traffic Update Software Active Directory Configuration User Training SSL/TLS Inspection Restrict File and Directory Permissions

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Linuxserver — Heimdall^AI

CWEs

CWE-918

References

Raw JSON (NVD)

Show

{
  "id": "CVE-2026-107449",
  "cveTags": [],
  "metrics": {
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-107449",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-10-08T17:34:52.742208Z"
        }
      }
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    "cvssMetricV31": [
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        "source": "cve@mitre.org",
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          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 3.4,
          "attackVector": "NETWORK",
          "baseSeverity": "LOW",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "REQUIRED",
          "attackComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 1.6
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "repo": "https://github.com/linuxserver/Heimdall",
          "vendor": "linuxserver",
          "modules": [
            "Enhanced app test/livestats (test_config",
            "get_stats)"
          ],
          "product": "Heimdall",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "versionType": "semver",
              "lessThanOrEqual": "2.8.3"
            }
          ],
          "programFiles": [
            "app/SupportedApps.php",
            "app/Http/Controllers/ItemController.php"
          ],
          "defaultStatus": "unknown",
          "programRoutines": [
            {
              "name": "SupportedApps::execute"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-10-08T05:17:04.297",
  "references": [
    {
      "url": "https://github.com/kashishtopi/heimdall-unauth-ssrf",
      "source": "cve@mitre.org"
    },
    {
      "url": "https://github.com/linuxserver/Heimdall/blob/9ad5864a80d7025db1e6eab8eb2981c165b0ddff/app/SupportedApps.php",
      "source": "cve@mitre.org"
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  "vulnStatus": "Deferred",
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      "description": [
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          "value": "CWE-918"
        }
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "linuxserver Heimdall through 2.8.3 applies its SafeUrlFetcher SSRF protection mechanism only to ItemController; the enhanced-application test and live-stats requests occur via SupportedApps::execute(), a GuzzleHttp client that lacks IP address restrictions. In some realistic installations, the POST /test_config (and GET /get_stats) endpoints are accessible through CSRF, and thus an unauthenticated attacker can force the server to send requests to arbitrary internal hosts and ports (including 169.254.169.254) and read a status/port oracle in addition to partial response data."
    }
  ],
  "lastModified": "2026-10-08T21:35:53.890",
  "sourceIdentifier": "cve@mitre.org"
}