GHSA-6j4c-mgqr-qv76: getkirby/cms (CVE-2026-75592)

Package	Ecosystem	Affected	Fixed in
getkirby/cms	Packagist	<4.9.5 \|\| >=5.0.0, <5.5.2	4.9.5, 5.5.2

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Kirby's media handler in the getkirby/cms Packagist package, versions before 4.9.5 and from 5.0.0 before 5.5.2, has a path traversal flaw in its containment checks. A sibling directory whose name starts with the same prefix as the site's index root can pass those checks. The source describes the impact as access to media files with job files stored in such sibling directories, which can lead to information leaks and deletion of the job file; it does not say what an attacker must already have, so the exact prerequisites are unclear. Upgrade to Kirby 4.9.5 or 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

Score	Rating	CVSS	Vector	Source
6.9	Medium	4.0	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0068, the 52nd 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

Sources

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.