CVE-2026-42051

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.

CVSS v3 4.3 MEDIUM

4.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/getkirby/kirby/releases/tag/4.9.0	Release Notes
https://github.com/getkirby/kirby/releases/tag/5.4.0	Release Notes
https://github.com/getkirby/kirby/security/advisories/GHSA-x68m-c7jf-2572	Patch Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:getkirby:kirby::::::::
	cpe:2.3:a:getkirby:kirby::::::::

History

18 May 2026, 13:01

Type	Values Removed	Values Added
References	~~() https://github.com/getkirby/kirby/releases/tag/4.9.0 -~~	() https://github.com/getkirby/kirby/releases/tag/4.9.0 - Release Notes
References	~~() https://github.com/getkirby/kirby/releases/tag/5.4.0 -~~	() https://github.com/getkirby/kirby/releases/tag/5.4.0 - Release Notes
References	~~() https://github.com/getkirby/kirby/security/advisories/GHSA-x68m-c7jf-2572 -~~	() https://github.com/getkirby/kirby/security/advisories/GHSA-x68m-c7jf-2572 - Patch, Vendor Advisory
First Time		Getkirby kirby Getkirby
CPE		cpe:2.3:a:getkirby:kirby::::::::
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 4.3

09 May 2026, 04:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-05-09 04:16

Updated : 2026-05-18 13:01

NVD link : CVE-2026-42051

Mitre link : CVE-2026-42051

CVE.ORG link : CVE-2026-42051

JSON object : View

Products Affected

getkirby

kirby

CWE

CWE-862

Missing Authorization

{"id": "CVE-2026-42051", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "LOW"}, "impactScore": 1.4, "exploitabilityScore": 2.8}], "cvssMetricV40": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 5.3, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "published": "2026-05-09T04:16:22.110", "references": [{"url": "https://github.com/getkirby/kirby/releases/tag/4.9.0", "tags": ["Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/getkirby/kirby/releases/tag/5.4.0", "tags": ["Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/getkirby/kirby/security/advisories/GHSA-x68m-c7jf-2572", "tags": ["Patch", "Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-862"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-05-18T13:01:29.620", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:getkirby:kirby:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1BB5394F-37F9-4A53-9CE7-79548F674886", "versionEndExcluding": "4.9.0"}, {"criteria": "cpe:2.3:a:getkirby:kirby:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B2D943B9-CD71-45FE-A1A4-158603C3502E", "versionEndExcluding": "5.4.0", "versionStartIncluding": "5.0.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}