Kirby: File upload permissions are not checked during processing of chunk data — GHSA-67MX-6WF2-92XP

Summary

### TL;DR This vulnerability affects all Kirby sites where users of a particular role have access to the REST API (`access.panel` permission is enabled) but no permission to upload any kind of file (`files.create`, `files.replace` and `user/users.update` permissions are all disabled). It was possible to fill up the temporary directory for chunked uploads with unfinished chunks even as a user without any upload…

Timeline

Published by source

2026-08-31

Risk context

• Reported severity or threat level: high.
• Reported CVSS score: 7.1 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-67MX-6WF2-92XP

Source

GitHub

Vendor

GitHub

Published by source

2026-08-31

Last source activity

2026-08-31

Additional identifiers

CVE-2026-71415

Curated by

hlukh.ch

Related advisories and connections

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