# Kirby: Request header injection in \`Http\Remote\`

Advisory record · `GHSA-4v4h-m2qq-ppgw`

- **Identifiers:** `GHSA-4v4h-m2qq-ppgw` · `CVE-2026-50188` · `PKSA-k11s-611y-v46q`
- **State:** Confirmed
- **Severity:** CVSS 6.9 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-93](https://cwe.mitre.org/data/definitions/93.html) · [CWE-113](https://cwe.mitre.org/data/definitions/113.html)
- **Tags:** [Other injection](https://agentprime.io/advisories/tag/injection.md)
- **Published:** 18 Jun 2026
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 18 Jun 2026, 15:04 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `getkirby/cms` (Packagist): affected `<4.9.4 || >=5.0.0-alpha.1, <5.4.4`; fixed in `4.9.4`, `5.4.4`

## 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

- 6.9 Medium, CVSS 4.0: `CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0044, the 39th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:01 UTC: First seen by agentprime
- 31 Oct 2026, 14:01 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-4v4h-m2qq-ppgw)

## Sources

- [GitHub Advisory Database: GHSA-4v4h-m2qq-ppgw](https://github.com/advisories/GHSA-4v4h-m2qq-ppgw)
- [OSV: GHSA-4v4h-m2qq-ppgw](https://osv.dev/vulnerability/GHSA-4v4h-m2qq-ppgw)
- <https://github.com/getkirby/kirby/security/advisories/GHSA-4v4h-m2qq-ppgw>
- <https://github.com/getkirby/kirby>
- <https://github.com/getkirby/kirby/releases/tag/4.9.4>
- <https://github.com/getkirby/kirby/releases/tag/5.4.4>

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-4v4h-m2qq-ppgw>, 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-4v4h-m2qq-ppgw/>. Everything for agents: <https://agentprime.io/llms.txt>.