CVE Watch4 de nov. de 2026

CVE-2026-119285

Fiber is an Express inspired web framework written in Go. From 2.52.1 until 2.52.3, the CORS middleware's validateDomain wildcard matcher in

CVSS

5.9

Média

EPSS

0.1%

KEV

—

Exploit Today

0-100

Publicado: 29 de out. de 2026 · Última mod.: 4 de nov. de 2026 · CWE-346 · CWE-942

EPSS · 30d

0.1%EPSS · 30 dias0.1%

2026-10-302026-11-06

Descrição técnica

Fiber is an Express inspired web framework written in Go. From 2.52.1 until 2.52.3, the CORS middleware's validateDomain wildcard matcher in middleware/cors/utils.go strips the scheme and checks only a host suffix without requiring a dot boundary. An application configured with a wildcard-subdomain AllowOrigins value and AllowCredentials enabled can reflect an unrelated attacker-controlled origin whose host merely ends with the configured base domain. A user who visits that origin can expose authenticated cross-origin responses to the attacker's page; empty-label origins and later comma-space parsing hardening are outside this advisory. This issue is fixed in version 2.52.3.

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