CVE-2024-27302

Authorization Bypass Through User-Controlled Key in go-zero

func isOriginAllowed(allows []string, origin string) bool {
	for _, o := range allows {
		if o == allOrigins {
			return true
		}

		if strings.HasSuffix(origin, o) {
			return true
		}
	}

	return false
}

package main

import (
	"errors"
	"net/http"

	"github.com/zeromicro/go-zero/rest"
)

func main() {
	svr := rest.MustNewServer(rest.RestConf{Port: 8888}, rest.WithRouter(mockedRouter{}), rest.WithCors("safe.com"))
	svr.Start()
}

type mockedRouter struct{}

// some sensitive path
func (m mockedRouter) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	// check user's cookie
	// ...
	// return sensitive data
	w.Write([]byte("social_id: 420101198008292930"))
}

func (m mockedRouter) Handle(_, _ string, handler http.Handler) error {
	return errors.New("foo")
}

func (m mockedRouter) SetNotFoundHandler(_ http.Handler) {
}

func (m mockedRouter) SetNotAllowedHandler(_ http.Handler) {
}

This vulnerability is capable of breaking CORS policy and thus allowing any page to make requests, retrieve data on behalf of other users.

CVE-2024-27302 has a CVSS score of 9.1 (Critical). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (1.4.4); upgrading removes the vulnerable code path.

Kodem intelligence

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1. What is CVE-2024-27302? CVE-2024-27302 is a critical-severity security vulnerability in github.com/zeromicro/go-zero (go), affecting versions < 1.4.4. It is fixed in 1.4.4.
2. How severe is CVE-2024-27302? CVE-2024-27302 has a CVSS score of 9.1 (Critical). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of github.com/zeromicro/go-zero are affected by CVE-2024-27302? github.com/zeromicro/go-zero (go) versions < 1.4.4 is affected.
4. Is there a fix for CVE-2024-27302? Yes. CVE-2024-27302 is fixed in 1.4.4. Upgrade to this version or later.
5. Is CVE-2024-27302 exploitable, and should I be worried? Whether CVE-2024-27302 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2024-27302 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2024-27302? Upgrade github.com/zeromicro/go-zero to 1.4.4 or later.