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Vulnerabilities

Vulnerability · CVE-2026-40099

Kirby is an open-source content management system.

Published Apr 24, 2026 · catalog updated Jun 17, 2026 · Kirby is an open-source

Check if you run it

No confirmed exploitation is on record for CVE-2026-40099. EPSS is 0.39%. Act only if a listed version of Kirby is an open-source is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Kirby is an open-source).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.39%
Remediation
Advisory link
Affected products
cpe getkirby/kirby

Kirby is an open-source content management system. Kirby's user permissions control which user role is allowed to perform specific actions to content models in the CMS. These permissions are defined for each role in the user blueprint ( ). It is also possible to customize the permissions for each target model in the model blueprints (such as in ) using the feature. The permissions and options together control the authorization of user actions. For pages, Kirby provides the and permissions (among others). Prior to versions 4.9.0 and 5.4.0, Kirby checked these permissions independently and only for the respective action. However the permission didn't take effect on page creation. New pages are created as drafts by default and need to be published by changing the page status of an existing page draft. This is ensured when the page is created via the Kirby Panel. However the REST API allows to override the flag when creating a new page. This allowed authenticated attackers with the permission to immediately create published pages, bypassing the normal editorial workflow. The problem has been patched in Kirby 4.9.0 and Kirby 5.4.0. Kirby has added a check to the page creation rules that ensures that users without the permission cannot create published pages, only page drafts.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe getkirby/kirbyversion unspecified

How to fix CVE-2026-40099

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-40099. EPSS is 0.39%. Act only if a listed version of Kirby is an open-source is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-863: Incorrect Authorization. EPSS 0.39%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 24, 2026 · NIST NVD

    Detected

    Kirby is an open-source content management system. Kirby's user permissions control which user role is allowed to perform specific actions to content models in the CMS. These permissions are defined for each role in the user blueprint ( ). It is also possible to customize the permissions for each target model in the model blueprints (such as in ) using the feature. The permissions and options toge

  2. Jun 17, 2026 · NIST NVD

    Updated

    Kirby is an open-source content management system. Kirby's user permissions control which user role is allowed to perform specific actions to content models in the CMS. These permissions are defined for each role in the user blueprint ( ). It is also possible to customize the permissions for each target model in the model blueprints (such as in ) using the feature. The permissions and options toge

Sources

  • CVE.orgVulnerability recordCVE-2026-40099

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-40099

    30-day exploitation probability 0.4%

    first.org
  • NIST NVDVulnerability recordCVE-2026-40099

    Kirby is an open-source content management system. Kirby's user permissions control which user role is allowed to perform specific actions to content models in the CMS. These permissions are defined for each role in the user blueprint ( ). It is also pos

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.