GHSA-9vx2-j98c-p72w: getkirby/cms (CVE-2026-75594)

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 (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

Score	Rating	CVSS	Vector	Source
8.2	High	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	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

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.