# github.com/gofiber/fiber/v2 vulnerable to Origin Validation Error

Advisory record · `GHSA-927h-x4qj-r242`

- **Identifiers:** `GHSA-927h-x4qj-r242` · `CVE-2018-20744` · `GO-2023-1792`
- **State:** Confirmed
- **Severity:** CVSS 5.9 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-346](https://cwe.mitre.org/data/definitions/346.html)
- **Tags:** [CWE-346](https://agentprime.io/advisories/tag/cwe-346.md)
- **Published:** 14 May 2022
- **Updated:** 20 May 2024
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 14 May 2022, 01:33 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `github.com/gofiber/fiber/v2` (Go): affected `>=2.0.0, <2.43.0`; fixed in `2.43.0`
- `github.com/rs/cors` (Go): affected `<1.5.0`; fixed in `1.5.0`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 5.9 Medium, CVSS 3.0: `CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** 0.0072, the 54th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the GitHub Advisory Database, published 14 May 2022. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-927h-x4qj-r242](https://github.com/advisories/GHSA-927h-x4qj-r242)
- [OSV: GHSA-927h-x4qj-r242](https://osv.dev/vulnerability/GHSA-927h-x4qj-r242)
- <https://nvd.nist.gov/vuln/detail/CVE-2018-20744>
- <https://github.com/gofiber/fiber/issues/2338>
- <https://github.com/rs/cors/issues/55>
- <https://github.com/gofiber/fiber/pull/2339>
- <https://github.com/rs/cors/pull/57>
- <https://github.com/gofiber/fiber>
- <https://web.archive.org/web/20200227091122/http://www.securityfocus.com/bid/106834>
- <https://www.usenix.org/system/files/conference/usenixsecurity18/sec18-chen.pdf>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-927h-x4qj-r242>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-927h-x4qj-r242/>. Everything for agents: <https://agentprime.io/llms.txt>.