CVE-2026-119285 Fiber: CORS wildcard origins matched without a dot boundary, allowing credentialed cross-origin reads
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-119285?
CVE-2026-119285 is a medium-severity vulnerability in gofiber fiber, published on 29 Oct 2026.
Official description
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.
Which versions are affected by CVE-2026-119285?
How do I fix CVE-2026-119285?
No fix has been published for CVE-2026-119285 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-119285 being exploited?
There is no known exploitation of CVE-2026-119285 in the wild and no public exploit code.