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CVE-2026-2880

Estado: AnalizadaAlta (8.2)—

A vulnerability in @fastify/middie versions < 9.2.0 can result in authentication/authorization bypass when using path-scoped middleware (for example, app.use('/secret', auth)).

When Fastify router normalization options are enabled (such as ignoreDuplicateSlashes, useSemicolonDelimiter, and related trailing-slash behavior), crafted request paths may bypass middleware checks while still being routed to protected handlers.

CVSS

Probabilidad de explotación (EPSS)

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.

Red sin privilegios (AV:N/PR:N) permite bypass de autenticación mediante normalización de rutas en middleware; acceso a datos protegidos y manipulación potencial de contenido.

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

Privileged Account ManagementApplication Developer GuidanceActive Directory ConfigurationVulnerability ScanningUser TrainingUser Account Management

Tecnologías afectadas (1)

Fastify — Fastify/middie

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2026-2880",
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          "options": [
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              "exploitation": "none"
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          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
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  "published": "2026-02-27T19:16:12.807",
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      "url": "https://github.com/fastify/middie/security/advisories/GHSA-8p85-9qpw-fwgw",
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        "Vendor Advisory"
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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    }
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  "lastModified": "2026-06-17T10:31:56.523",
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