# actionpack Open Redirect in Host Authorization Middleware

Advisory record · `GHSA-qphc-hf5q-v8fc`

- **Identifiers:** `GHSA-qphc-hf5q-v8fc` · `BIT-rails-2021-44528` · `CVE-2021-44528`
- **State:** Confirmed
- **Severity:** CVSS 6.1 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-601](https://cwe.mitre.org/data/definitions/601.html)
- **Tags:** [Open redirect](https://agentprime.io/advisories/tag/open-redirect.md)
- **Published:** 14 Dec 2021
- **Updated:** 6 Mar 2024
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 14 Dec 2021, 21:19 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `actionpack` (RubyGems): affected `>=6.0.0, <6.0.4.2 || >=6.1.0, <6.1.4.2`; fixed in `6.0.4.2`, `6.1.4.2`

## 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

- 6.1 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** 0.044, the 91st percentile, on 10 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 Dec 2021. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-qphc-hf5q-v8fc](https://github.com/advisories/GHSA-qphc-hf5q-v8fc)
- [OSV: GHSA-qphc-hf5q-v8fc](https://osv.dev/vulnerability/GHSA-qphc-hf5q-v8fc)
- <https://nvd.nist.gov/vuln/detail/CVE-2021-44528>
- <https://github.com/rails/rails/commit/0fccfb9a3097a9c4260c791f1a40b128517e7815>
- <https://github.com/rails/rails/commit/aecba3c301b80e9d5a63c30ea1b287bceaf2c107>
- <https://github.com/rails/rails>
- <https://github.com/rails/rails/blob/v6.1.4.2/actionpack/CHANGELOG.md#rails-6142-december-14-2021>
- <https://github.com/rubysec/ruby-advisory-db/blob/master/gems/actionpack/CVE-2021-44528.yml>
- <https://groups.google.com/g/ruby-security-ann/c/vG9gz3nk1pM/m/7-NU4MNrDAAJ>
- <https://groups.google.com/g/ruby-security-ann/c/vG9gz3nk1pM/m/7-NU4MNrDAAJ?utm_medium=email&utm_source=footer>
- <https://security.netapp.com/advisory/ntap-20240208-0003>
- <https://www.debian.org/security/2023/dsa-5372>

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-qphc-hf5q-v8fc>, 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-qphc-hf5q-v8fc/>. Everything for agents: <https://agentprime.io/llms.txt>.