{
  "cvss": 9.8,
  "datePublished": "2026-08-21T14:16:53.903",
  "dateUpdated": "2026-10-15T19:10:00.173",
  "description": "SPIP before 4.4.21 allows unauthenticated remote attackers to execute arbitrary code, as exploited in the wild in August 2026. This is related to code injection via an X-Spip-Filtre HTTP request header that is mishandled by analyse_resultat_skel.",
  "id": "CVE-2026-77806",
  "raw": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "SPIP",
            "vendor": "SPIP",
            "versions": [
              {
                "lessThan": "4.4.21",
                "status": "affected",
                "version": "0",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "cve@mitre.org"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "SPIP before 4.4.21 allows unauthenticated remote attackers to execute arbitrary code, as exploited in the wild in August 2026. This is related to code injection via an X-Spip-Filtre HTTP request header that is mishandled by analyse_resultat_skel."
      },
      {
        "lang": "es",
        "value": "SPIP anterior a la versión 4.4.21 permite a atacantes remotos no autenticados ejecutar código arbitrario, según se explotó activamente en agosto de 2026. Esto está relacionado con la inyección de código a través de un encabezado de solicitud HTTP X-Spip-Filtre que es mal manejado por analyse_resultat_skel."
      }
    ],
    "id": "CVE-2026-77806",
    "lastModified": "2026-10-15T19:10:00.173",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "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:H",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 5.9,
          "source": "cve@mitre.org",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-77806",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "yes"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-08-21T17:43:22.719145Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-08-21T14:16:53.903",
    "references": [
      {
        "source": "cve@mitre.org",
        "url": "https://blog.spip.net/Mise-a-jour-critique-de-securite-sortie-de-SPIP-4-4-21.html"
      },
      {
        "source": "cve@mitre.org",
        "url": "https://github.com/rapid7/metasploit-framework/pull/21790"
      },
      {
        "source": "cve@mitre.org",
        "url": "https://github.com/rapid7/metasploit-framework/pull/21790#issuecomment-5368038123"
      },
      {
        "source": "cve@mitre.org",
        "url": "https://github.com/rapid7/metasploit-framework/pull/21790/commits/b16eca819abb8f1401f21d115e71e3dfc67b847c"
      }
    ],
    "sourceIdentifier": "cve@mitre.org",
    "vulnStatus": "Deferred",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-94"
          }
        ],
        "source": "cve@mitre.org",
        "type": "Secondary"
      }
    ]
  },
  "severity": "CRITICAL",
  "source": "nvd",
  "title": "SPIP before 4.4.21 allows unauthenticated remote attackers to execute arbitrary code, as exploited in the wild in Aug..."
}