CVE-2026-42261

{
  "id": "CVE-2026-42261",
  "sourceIdentifier": "[email protected]",
  "published": "2026-05-08T04:16:20.107",
  "lastModified": "2026-10-26T20:10:00.160",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "PromptHub is an all-in-one AI toolbox for prompt, skill, and agent management. From version 0.4.9 to before version 0.5.4, apps/web/src/routes/skills.ts exposes an authenticated endpoint POST /api/skills/fetch-remote that fetches a user-supplied URL server-side and reflects the response body (up to 5 MB) back to the caller. The SSRF protection in apps/web/src/utils/remote-http.ts (isPrivateIPv6) attempts to block private/loopback destinations, but multiple alternate-but-valid IPv6 representations bypass the check. The bypasses reach any IPv4 address (loopback, RFC1918, link-local) via IPv4-mapped IPv6 in hex form, and the canonical ::1 via any representation that isn't the literal string \"::1\". Any authenticated user (role: user or admin) can trigger the SSRF. On deployments configured with ALLOW_REGISTRATION=true — a supported and documented configuration — this means any internet user who can register. This issue has been patched in version 0.5.4."
    },
    {
      "lang": "es",
      "value": "PromptHub es una caja de herramientas de IA todo en uno para la gestión de prompts, habilidades y agentes. Desde la versión 0.4.9 hasta antes de la versión 0.5.4, apps/web/src/routes/skills.ts expone un endpoint autenticado POST /API/skills/fetch-remote que obtiene una URL proporcionada por el usuario en el lado del servidor y refleja el cuerpo de la respuesta (hasta 5 MB) de vuelta al llamador. La protección SSRF en apps/web/src/utils/remote-HTTP.ts (isPrivateIPv6) intenta bloquear destinos privados/loopback, pero múltiples representaciones IPv6 alternativas pero válidas eluden la verificación. Las elusiones alcanzan cualquier dirección IPv4 (loopback, RFC1918, link-local) a través de IPv6 mapeado a IPv4 en formato hexadecimal, y el canónico ::1 a través de cualquier representación que no sea la cadena literal ’::1’. Cualquier usuario autenticado (rol: usuario o administrador) puede activar el SSRF. En despliegues configurados con ALLOW_REGISTRATION=true - una configuración soportada y documentada - esto significa cualquier usuario de internet que pueda registrarse. Este problema ha sido parcheado en la versión 0.5.4."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "legeling",
          "product": "PromptHub",
          "versions": [
            {
              "version": ">= 0.4.9, < 0.5.4",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "LOW",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 4.2
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-05-11T18:10:25.854871Z",
          "id": "CVE-2026-42261",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        },
        {
          "lang": "en",
          "value": "CWE-693"
        },
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:legeling:prompthub:*:*:*:*:-:*:*:*",
              "versionStartIncluding": "0.4.9",
              "versionEndExcluding": "0.5.4",
              "matchCriteriaId": "70AA7323-FB30-4401-9F87-B09372E70663"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/legeling/PromptHub/releases/tag/v0.5.4",
      "source": "[email protected]",
      "tags": [
        "Patch",
        "Product"
      ]
    },
    {
      "url": "https://github.com/legeling/PromptHub/security/advisories/GHSA-9fhh-fjfg-5mr6",
      "source": "[email protected]",
      "tags": [
        "Exploit",
        "Mitigation",
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://github.com/legeling/PromptHub/security/advisories/GHSA-9fhh-fjfg-5mr6",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Mitigation",
        "Vendor Advisory"
      ]
    }
  ]
}