# Secure Headers: CSP directive injection via sandbox, plugin_types, and report_to when given untrusted input

Advisory record · `GHSA-rqq5-2gf9-4w4q`

- **Identifiers:** `GHSA-rqq5-2gf9-4w4q` · `CVE-2026-54163`
- **State:** Confirmed
- **Severity:** CVSS 4.7 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-79](https://cwe.mitre.org/data/definitions/79.html) · [CWE-113](https://cwe.mitre.org/data/definitions/113.html)
- **Tags:** [Cross-site scripting (XSS)](https://agentprime.io/advisories/tag/xss.md) · [Other injection](https://agentprime.io/advisories/tag/injection.md)
- **Published:** 10 Jul 2026
- **Updated:** 10 Jul 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 10 Jul 2026, 20:37 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `secure_headers` (RubyGems): affected `<7.3.0`; fixed in `7.3.0`

## 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

- 4.7 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0021, the 11th percentile, on 5 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 10 Jul 2026. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-rqq5-2gf9-4w4q](https://github.com/advisories/GHSA-rqq5-2gf9-4w4q)
- [OSV: GHSA-rqq5-2gf9-4w4q](https://osv.dev/vulnerability/GHSA-rqq5-2gf9-4w4q)
- <https://github.com/github/secure_headers/security/advisories/GHSA-rqq5-2gf9-4w4q>
- <https://github.com/github/secure_headers>
- <https://github.com/rubysec/ruby-advisory-db/blob/master/gems/secure_headers/CVE-2026-54163.yml>
- <https://www.cve.org/CVERecord/SearchResults?query=CVE-2026-54163>

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-rqq5-2gf9-4w4q>, 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-rqq5-2gf9-4w4q/>. Everything for agents: <https://agentprime.io/llms.txt>.