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Medium 5.9
Fiber: CORS wildcard origins matched without a dot boundary, allowing credentialed cross-origin reads
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 applicat…
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Medium 4.8
Fiber: HSTS header never set in helmet middleware due to incorrect protocol check
Fiber is an Express inspired web framework written in Go. Prior to 3.4.0, the helmet middleware in middleware/helmet/helmet.go never sets the Strict-Transport-Security response header even when HSTSMaxAge is configured because it checks c.Protocol() for https…
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Medium 5.3
Fiber: X-Real-IP Spoofing via Header.Add() in BalancerForward
Fiber is an Express inspired web framework written in Go. Prior to 3.3.0 and 2.52.14, the BalancerForward proxy helper in middleware/proxy/proxy.go uses Header.Add() instead of Header.Set() when injecting X-Real-IP, allowing an attacker-supplied first X-Real-…