# Kirby CMS has pre-authentication path traversal and PHP file inclusion during user lookup

Advisory record · `GHSA-9hx7-c53c-v6x8`

- **Identifiers:** `GHSA-9hx7-c53c-v6x8` · `CVE-2026-44177` · `PKSA-82wy-dsmt-xgpc`
- **State:** Confirmed
- **Severity:** CVSS 8.8 High
- **Critical:** No
- **Weakness (CWE):** [CWE-22](https://cwe.mitre.org/data/definitions/22.html) · [CWE-98](https://cwe.mitre.org/data/definitions/98.html)
- **Tags:** [Path traversal](https://agentprime.io/advisories/tag/path-traversal.md) · [File inclusion](https://agentprime.io/advisories/tag/file-inclusion.md)
- **Published:** 26 May 2026
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 26 May 2026, 23:56 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `getkirby/cms` (Packagist): affected `>=5.3.0, <5.4.1`; fixed in `5.4.1`

## 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.018, the 78th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 13:59 UTC: First seen by agentprime
- 31 Oct 2026, 13:59 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-9hx7-c53c-v6x8)

## Sources

- [GitHub Advisory Database: GHSA-9hx7-c53c-v6x8](https://github.com/advisories/GHSA-9hx7-c53c-v6x8)
- [OSV: GHSA-9hx7-c53c-v6x8](https://osv.dev/vulnerability/GHSA-9hx7-c53c-v6x8)
- <https://github.com/getkirby/kirby/security/advisories/GHSA-9hx7-c53c-v6x8>
- <https://github.com/getkirby/kirby>
- <https://github.com/getkirby/kirby/releases/tag/5.4.1>

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-9hx7-c53c-v6x8>, 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-9hx7-c53c-v6x8/>. Everything for agents: <https://agentprime.io/llms.txt>.