CVE-2026-75594

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

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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.

CVSS 8.2 · Élevée · EPSS 0,8% · Correctif disponible

Publication

2026-08-31T20:53:00.338Z

Mise à jour

2026-09-01T14:31:42.348Z

Pile logicielle: php

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