# Kirby: Access to image files and limited access to JSON files outside of the site root via path traversal in the media handling Advisory record · `GHSA-9vx2-j98c-p72w` - **Identifiers:** `GHSA-9vx2-j98c-p72w` · `CVE-2026-75594` · `PKSA-n74d-ghht-18nt` - **State:** Confirmed - **Severity:** CVSS 8.2 High - **Critical:** No - **Weakness (CWE):** [CWE-22](https://cwe.mitre.org/data/definitions/22.html) - **Tags:** [Path traversal](https://agentprime.io/advisories/tag/path-traversal.md) - **Published:** 31 Aug 2026 - **Updated:** 31 Aug 2026 - **Reviewed by a person:** No Published by the GitHub Advisory Database at 31 Aug 2026, 22:12 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. ## Affected packages - `getkirby/cms` (Packagist): affected `<4.9.5 || >=5.0.0, <5.5.2`; fixed in `4.9.5`, `5.5.2` ## Machine-written summary Summary written by Claude Haiku from the source advisory. Not reviewed by a person. > Kirby (Packagist package getkirby/cms) versions below 4.9.5 and from 5.0.0 up to but not including 5.5.2 are affected by a path traversal flaw in the media handling. On servers that accept encoded slashes in URLs, such as nginx or PHP's built-in server, a remote attacker can request thumbnails of media files in arbitrary accessible directories and detect whether JSON files exist elsewhere on the server; the source says this is high severity and that Apache with default settings is not affected. Upgrade to Kirby 4.9.5, 5.5.2, or a later version. Written 31 Oct 2026. ## 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 - 8.2 High, CVSS 4.0: `CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N`, from CNA (GitHub_M) - **CISA KEV:** Not listed. - **EPSS:** 0.0076, the 55th percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days. ## Timeline - 31 Oct 2026, 14:06 UTC: First seen by agentprime - 31 Oct 2026, 14:06 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-9vx2-j98c-p72w) ## Sources - [GitHub Advisory Database: GHSA-9vx2-j98c-p72w](https://github.com/advisories/GHSA-9vx2-j98c-p72w) - [OSV: GHSA-9vx2-j98c-p72w](https://osv.dev/vulnerability/GHSA-9vx2-j98c-p72w) - - - - - - - - - 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 (), 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: - In a browser: reads your lockfile in the browser, never uploading it. - Whether it touches your code, with file and line: the Claude Code plugin, - As JSON: , or `POST https://api.agentprime.io/v1/match` with your packages () --- The web page: . Everything for agents: .