CVE-2026-42051 PUBLISHED

Kirby: System API endpoint leaks license data and installed version to authenticated users

Assigner: GitHub_M
Reserved: 23.04.2026 Published: 09.05.2026 Updated: 09.05.2026

Kirby is an open-source content management system. Prior to versions 4.9.0 and 5.4.0, the system API endpoint leaks license data and installed version to authenticated users. This issue has been patched in versions 4.9.0 and 5.4.0.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS Score: 5.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	Low	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

Product Status

Vendor	getkirby
Product	kirby
Versions	Version < 4.9.0 is affected Version >= 5.0.0, < 5.4.0 is affected

References

Problem Types

CWE-862: Missing Authorization CWE