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Vulnerability · Published Aug 31, 2026 · Assigned by GitHub_M

CVE-2026-75594Kirby: Access to image files and limited access to JSON files outside of the site root via path traversal in the media handling

High 8.2

In plain English

A high-severity path traversal in kirby from getkirby. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 56% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.2High
Exploit odds (30 days)0.8%top 44.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Kirby is an open-source content management system. Prior to 4.9.5 and 5.5.2, depending on the release line, Kirby's media handler in src/Cms/Media.php allowed Kirby\Cms\Media::thumb() to append a path-bearing filename to a validated parent media directory. On nginx, PHP's built-in server, or Apache with AllowEncodedSlashes enabled, a remote attacker could submit encoded slash characters such as %2f in the filename and traverse outside the parent's media directory. Differences between responses for existing and nonexistent thumbnail configurations disclosed whether an arbitrary .json file existed, and a .json file containing a valid filename key could cause the referenced image to be returned and the job file to be deleted. The related file::version path in src/Filesystem/Asset.php also accepted ../ sequences outside the intended index root. This issue is fixed in versions 4.9.5 and 5.5.2.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Packagistgetkirby/cms4.9.5GHSA-9vx2-j98c-p72w
Packagistgetkirby/cms5.5.2GHSA-9vx2-j98c-p72w

Affected products (as reported)

VendorProductVersions
getkirby kirby < 4.9.5>= 5.0.0, < 5.5.2

Weakness: CWE-22 · Vector: 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

References