CVE-2026-40099: Kirby's page creation API bypasses the changeStatus permission check via unfiltered isDraft parameter

medium Affects getkirby/cms. Feed 2026.10.29.4, updated 2026-10-29; published 2026-04-23; advisory modified 2026-05-05.

Kirby's page creation API bypasses the changeStatus permission check via unfiltered isDraft parameter

Package: getkirby/cms Composer
Affected versions: <4.9.0 or >=5.0.0 and <5.4.0
Fixed in: 4.9.0, 5.4.0
Severity: medium
Exploitation: not on CISA KEV · EPSS 0% (20.0th percentile)
Published: 2026-04-23
Source: osv.dev

References

CWE-863

NVD record getkirby/cms advisories

Am I affected?

Find out in one command. phpwarden checks your composer.lock against this advisory and 20,000+ others, ranked by real-world exploitation (CISA KEV + EPSS). Free, offline, open data.

# PHP projects (recommended)
composer require --dev phpwarden/phpwarden
# then
vendor/bin/phpwarden deps composer.lock

# or, without Composer
pipx install phpwarden   &&   phpwarden deps composer.lock

Or keep it checked automatically: GitHub Action · pre-commit hook · GitLab CI · Laravel artisan command

Install docs How findings are ranked

Related advisories

CVE-2021-29460 high Cross-site scripting (XSS) from unsanitized uploaded SVG files in Kirby same package: getkirby/cms
CVE-2017-16807 medium Kirby XSS Vulnerability same package: getkirby/cms
CVE-2026-44177 high Kirby CMS has pre-authentication path traversal and PHP file inclusion during user lookup same package: getkirby/cms
CVE-2023-38490 medium XML External Entity (XXE) vulnerability in the XML data handler same package: getkirby/cms
CVE-2020-26255 medium Kirby Panel users could upload PHP Phar archives as content files before v2.5.14 and v3.4. same package: getkirby/cms
CVE-2023-38492 medium Denial of service from unlimited password lengths same package: getkirby/cms