CVE-2026-24096

CVE-2026-24096 is a high-severity vulnerability in Checkmk with a CVSS 3.x base score of 8.8. 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-280.

Key facts

• Severity: High (CVSS 3.x base score 8.8)
• CVSS v4: 5.3
• EPSS exploit prediction: 0% (15th percentile)
• Actively exploited: Not listed in CISA KEV
• EU (EUVD) id: EUVD-2026-17867
• Weakness: CWE-280
• Affected product: Checkmk
• Published: 2026-04-01
• Last modified: 2026-06-17

Description

Insufficient permission validation on multiple REST API Quick Setup endpoints in Checkmk 2.5.0 (beta) before version 2.5.0b2 and 2.4.0 before version 2.4.0p25 allows low-privileged users to perform unauthorized actions or obtain sensitive information

Frequently asked questions

What is CVE-2026-24096?

Insufficient permission validation on multiple REST API Quick Setup endpoints in Checkmk 2.5.0 (beta) before version 2.5.0b2 and 2.4.0 before version 2.4.0p25 allows low-privileged users to perform unauthorized actions or obtain sensitive information

How severe is CVE-2026-24096?

CVE-2026-24096 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-24096 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-24096?

CVE-2026-24096 primarily affects Checkmk. In total, 32 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-24096?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-24096 have an EU (EUVD) identifier?

Yes. CVE-2026-24096 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17867.

When was CVE-2026-24096 published?

CVE-2026-24096 was published on 2026-04-01 and last updated on 2026-06-17.

References

• https://checkmk.com/werk/18989

Affected products (32)

• cpe:2.3:a:checkmk:checkmk:2.4.0:-:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.4.0:b1:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.4.0:b2:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.4.0:b3:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.4.0:b4:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.4.0:b5:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.4.0:b6:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.4.0:p1:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.4.0:p10:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.4.0:p11:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.4.0:p12:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.4.0:p13:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.4.0:p14:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.4.0:p15:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.4.0:p16:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.4.0:p17:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.4.0:p18:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.4.0:p19:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.4.0:p2:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.4.0:p20:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.4.0:p21:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.4.0:p22:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.4.0:p23:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.4.0:p24:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.4.0:p3:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.4.0:p4:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.4.0:p5:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.4.0:p6:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.4.0:p7:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.4.0:p8:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.4.0:p9:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.5.0:b1:*:*:*:*:*:*

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