Permissive Cross-domain Policy with Untrusted Domains Affecting github.com/gofiber/fiber/v2/middleware/cors package, versions >=2.52.1 <2.52.3
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published12 Nov 2026
- disclosed30 Oct 2026
- creditUnknown
Introduced: 30 Oct 2026
NewCVE-2026-119285 (opens in a new tab)How to fix?
Upgrade github.com/gofiber/fiber/v2/middleware/cors to version 2.52.3 or higher.
Overview
Affected versions of this package are vulnerable to Permissive Cross-domain Policy with Untrusted Domains via the wildcard-origin matcher in the CORS middleware. An attacker can read a victim’s authenticated responses by having the victim visit a page on a host such as evil-example.com or notexample.com, when the application allows https://*.example.com and enables AllowCredentials; the matcher accepts the host suffix without requiring a dot boundary or matching the scheme, so the middleware reflects the attacker’s origin with credentialed CORS headers.