FKIE_CVE-2026-26747

Vulnerability from fkie_nvd - Published: 2026-02-20 17:25 - Updated: 2026-02-26 02:42
Severity ?
9.1 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Summary
A Host Header Poisoning vulnerability exists in Monica 4.1.2 due to improper handling of the HTTP Host header in app/Providers/AppServiceProvider.php, combined with the default misconfiguration where the "app.force_url" is not set and default is "false". The application generates absolute URLs (such as those used in password reset emails) using the user-supplied Host header. This allows remote attackers to poison the password reset link sent to a victim,
References
cve@mitre.orghttps://github.com/hungnqdz/cve-research/blob/main/CVE-2026-26747.mdExploit, Vendor Advisory
cve@mitre.orghttps://github.com/monicahq/monicaProduct
Impacted products
Vendor Product Version
monicahq monica 4.1.2
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:monicahq:monica:4.1.2:*:*:*:*:*:*:*",
              "matchCriteriaId": "9B4E9530-0DB5-4B0C-BF09-3BCD409A20F9",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A Host Header Poisoning vulnerability exists in Monica 4.1.2 due to improper handling of the HTTP Host header in app/Providers/AppServiceProvider.php, combined with the default misconfiguration where the \"app.force_url\" is not set and default is \"false\". The application generates absolute URLs (such as those used in password reset emails) using the user-supplied Host header. This allows remote attackers to poison the password reset link sent to a victim,"
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de envenenamiento de encabezado Host existe en Monica 4.1.2 debido a un manejo inadecuado del encabezado HTTP Host en app/Providers/AppServiceProvider.php, combinado con la configuraci\u00f3n err\u00f3nea predeterminada donde \u0027app.force_url\u0027 no est\u00e1 configurado y su valor predeterminado es \u0027false\u0027. La aplicaci\u00f3n genera URLs absolutas (como las utilizadas en los correos electr\u00f3nicos de restablecimiento de contrase\u00f1a) utilizando el encabezado Host proporcionado por el usuario. Esto permite a atacantes remotos envenenar el enlace de restablecimiento de contrase\u00f1a enviado a una v\u00edctima."
    }
  ],
  "id": "CVE-2026-26747",
  "lastModified": "2026-02-26T02:42:23.743",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 9.1,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.2,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-02-20T17:25:56.023",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/hungnqdz/cve-research/blob/main/CVE-2026-26747.md"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Product"
      ],
      "url": "https://github.com/monicahq/monica"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-644"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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