{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:flarum:flarum:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "A2171054-A339-41DC-9280-C90AD2727BBC",
              "versionEndExcluding": "1.8.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Flarum is open-source forum software. A session hijacking vulnerability exists in versions prior to 1.8.10 when an attacker-controlled authoritative subdomain under a parent domain (e.g., `subdomain.host.com`) sets cookies scoped to the parent domain (`.host.com`). This allows session token replacement for applications hosted on sibling subdomains (e.g., `community.host.com`) if session tokens aren\u0027t rotated post-authentication. Key Constraints are that the attacker must control any subdomain under the parent domain (e.g., `evil.host.com` or `x.y.host.com`), and the parent domain must not be on the Public Suffix List. Due to non-existent session token rotation after authenticating we can theoretically reproduce the vulnerability by using browser dev tools, but due to the browser\u0027s security measures this does not seem to be exploitable as described. Version 1.8.10 contains a patch for the issue."
    },
    {
      "lang": "es",
      "value": "Flarum es un software de foros de c\u00f3digo abierto. Existe una vulnerabilidad de secuestro de sesi\u00f3n en versiones anteriores a la 1.8.10 cuando un subdominio autorizado controlado por un atacante bajo un dominio principal (p. ej., `subdomain.host.com`) establece cookies con alcance en el dominio principal (`.host.com`). Esto permite el reemplazo de tokens de sesi\u00f3n para aplicaciones alojadas en subdominios hermanos (p. ej., `community.host.com`) si los tokens de sesi\u00f3n no se rotan despu\u00e9s de la autenticaci\u00f3n. Las restricciones clave son que el atacante debe controlar cualquier subdominio bajo el dominio principal (p. ej., `evil.host.com` o `xyhost.com`), y el dominio principal no debe estar en la lista de sufijos p\u00fablicos. Debido a la inexistencia de rotaci\u00f3n de tokens de sesi\u00f3n despu\u00e9s de la autenticaci\u00f3n, te\u00f3ricamente podemos reproducir la vulnerabilidad usando herramientas de desarrollo del navegador, pero debido a las medidas de seguridad del navegador, esto no parece ser explotable como se describe. La versi\u00f3n 1.8.10 contiene un parche para el problema."
    }
  ],
  "id": "CVE-2025-27794",
  "lastModified": "2025-04-02T12:33:56.437",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.8,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.6,
        "impactScore": 5.2,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.8,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.6,
        "impactScore": 5.2,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2025-03-12T14:15:17.033",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/flarum/framework/commit/a05aaea3ee1e0a8b870935183193cd6052f1d402"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/flarum/framework/releases/tag/v1.8.10"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://github.com/flarum/framework/security/advisories/GHSA-hg9j-64wp-m9px"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-74"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}