How severe is CVE-2026-42051?

CVE-2026-42051 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-42051 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-42051?

CVE-2026-42051 affects Getkirby Kirby. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-42051?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-42051 have an EU (EUVD) identifier?

Yes. CVE-2026-42051 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28887.

When was CVE-2026-42051 published?

CVE-2026-42051 was published on 2026-05-09 and last updated on 2026-06-17.

CVE-2026-42051

CVE-2026-42051 is a medium-severity vulnerability in Getkirby Kirby with a CVSS 3.x base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-862.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v4: 5.3
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-28887
Weakness: CWE-862
Affected product: Getkirby Kirby
Published: 2026-05-09
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-42051?: CVE-2026-42051 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-42051 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-42051?: CVE-2026-42051 affects Getkirby Kirby. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-42051?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-42051 have an EU (EUVD) identifier?: Yes. CVE-2026-42051 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28887.
When was CVE-2026-42051 published?: CVE-2026-42051 was published on 2026-05-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:getkirby:kirby:*:*:*:*:*:*:*:*

More vulnerabilities in Getkirby Kirby

CVE-2025-31493 — Critical (CVSS 9.1): Kirby is an open-source content management system. A vulnerability in versions prior to 3.9.8.3, 3.10.1.2, and 4.7.1…
CVE-2025-30159 — Critical (CVSS 9.1): Kirby is an open-source content management system. A vulnerability in versions prior to 3.9.8.3, 3.10.1.2, and 4.7.1…
CVE-2026-41325 — High (CVSS 8.8): Kirby is an open-source content management system. Kirby's user permissions control which user role is allowed to…
CVE-2024-26483 — High (CVSS 8.8): An arbitrary file upload vulnerability in the Profile Image module of Kirby CMS v4.1.0 allows attackers to execute…
CVE-2026-34587 — High (CVSS 8.1): Kirby is an open-source content management system. Prior to versions 4.9.0 and 5.4.0, Kirby's user permissions control…
CVE-2024-41964 — High (CVSS 8.1): Kirby is a CMS targeting designers and editors. Kirby allows to restrict the permissions of specific user roles. Users…

All CVEs affecting Getkirby Kirby →

Other CWE-862 (Missing Authorization) vulnerabilities

CVE-2026-0092 — Critical (CVSS 10.0): In Package Manager, there is a possible device lock controller bypass due to a missing permission check. This could…
CVE-2026-33712 — Critical (CVSS 10.0): Typebot is a chatbot builder tool. In versions 3.15.2 and prior, the preview chat endpoint (POST…
CVE-2026-2031 — Critical (CVSS 10.0): An Improper Access Control vulnerability in several internal API endpoints for Google Cloud Application Integration…
CVE-2026-34976 — Critical (CVSS 10.0): Dgraph is an open source distributed GraphQL database. Prior to 25.3.1, the restoreTenant admin mutation is missing…
CVE-2025-30416 — Critical (CVSS 10.0): Sensitive data disclosure and manipulation due to missing authorization. The following products are affected: Acronis…
CVE-2025-45854 — Critical (CVSS 10.0): /server/executeExec of JEHC-BPM 2.0.1 allows attackers to execute arbitrary code via execParams.

Browse all CWE-862 (Missing Authorization) vulnerabilities →