Kirby: Access to image files and limited access to JSON files outside of the site root via path traversal in the media handling — GHSA-9VX2-J98C-P72W

Summary

### TL;DR This vulnerability affects all Kirby sites that are deployed to a server that allows requests for URLs with encoded slashes (`%2f`), such as nginx, PHP's built-in server or Apache setups that have the option `AllowEncodedSlashes` enabled. It was possible to create and access thumbnails from media files in arbitrary accessible directories on the server that have a valid thumbnail configuration (JSON job…

Timeline

Published by source

2026-08-31

Risk context

• Reported severity or threat level: high.
• Reported CVSS score: 8.2 out of 10.
• Review exposure for the affected product or family: composer: getkirby/cms.

Product

composer: getkirby/cms

What to do

General, cautious steps (verify details in the official source):

• Prioritize patching or mitigation immediately (treat as actively risky).
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

Evidence and provenance

Canonical advisory ID

GHSA-9VX2-J98C-P72W

Source

GitHub

Vendor

GitHub

Published by source

2026-08-31

Last source activity

2026-08-31

Additional identifiers

CVE-2026-75594

Curated by

hlukh.ch

Related advisories and connections

These advisories are connected by shared CVE, product, vendor, source, or time signals.