CVE-2026-86158

Estado: Pendiente de análisisAlta (7.7)—

Missing authentication in the local .NET backend (Fiddler.WebUi) of Progress Software Fiddler Everywhere 8.0.2 allows a local unauthenticated attacker to mint OAuth tokens and read the machine-in-the-middle root certificate through an unauthenticated localhost HTTP and SignalR RPC channel.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Puntuación base: 7.7

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.09%
Percentil entre todas las CVEs puntuadas: 0
Fecha de la puntuación: 5/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation92 %
Impacto principalT1078 Valid Accountsstealth · persistence · privilege escalation · initial access88 %
Impacto secundarioT1552.001 Credentials In Filescredential access85 %

Vector AV:L sin privilegios (PR:N) indica escalada local. CWE-306 (falta de autenticación) en backend permite mintear tokens OAuth y acceder a certificado raíz sin autenticación en localhost.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

User Training Password Policies Application Developer Guidance Active Directory Configuration User Account Management Threat Intelligence Program

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Progress Software — Fiddler Everywhere^AI

CWE

CWE-306

Referencias

https://www.telerik.com/fiddler/fiddler-everywhere/documentation/knowledge-base/kb-security-missing-authentication-for-critical-function-cve-2026-86158

JSON original (NVD)

Mostrar

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  "id": "CVE-2026-86158",
  "cveTags": [],
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        "ssvcData": {
          "id": "CVE-2026-86158",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
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          ],
          "version": "2.0.3",
          "timestamp": "2026-09-30T15:18:22.768601Z"
        }
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    ],
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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
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        "exploitabilityScore": 2.5
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  "affected": [
    {
      "source": "security@progress.com",
      "affectedData": [
        {
          "vendor": "Progress Software",
          "product": "Progress® Telerik® Fiddler® Everywhere",
          "versions": [
            {
              "status": "affected",
              "version": "1.0.0",
              "lessThan": "8.2.0",
              "versionType": "custom"
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  "published": "2026-09-29T07:16:35.520",
  "references": [
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      "source": "security@progress.com"
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      "description": [
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  "lastModified": "2026-09-30T16:19:21.907",
  "sourceIdentifier": "security@progress.com"
}