Vulnerability in Gofiber Fiber
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 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.
Published .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Gofiber Fiber — versions >= 2.52.1, < 2.52.3
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-119285?
- CVE-2026-119285 is a medium-severity vulnerability in Gofiber Fiber, classified under Origin Validation Error. CVSS score: 5.9/10. Published 2026-10-29.
- How severe is CVE-2026-119285?
- Medium severity. CVSS v3 base score is 5.9 out of 10.