CVE-2025-2596

CVE-2025-2596 is a medium-severity vulnerability in Checkmk with a CVSS 3.x base score of 5.3. 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-613.

Key facts

• Severity: Medium (CVSS 3.x base score 5.3)
• CVSS v4: 2.3
• EPSS exploit prediction: 0% (9th percentile)
• Actively exploited: Not listed in CISA KEV
• EU (EUVD) id: EUVD-2025-8123
• Weakness: CWE-613
• Affected product: Checkmk
• Published: 2025-03-26
• Last modified: 2026-06-17

Description

Session logout could be overwritten in Checkmk GmbH's Checkmk versions <2.3.0p30, <2.2.0p41, and 2.1.0p49 (EOL)

Frequently asked questions

What is CVE-2025-2596?

Session logout could be overwritten in Checkmk GmbH's Checkmk versions <2.3.0p30, <2.2.0p41, and 2.1.0p49 (EOL)

How severe is CVE-2025-2596?

CVE-2025-2596 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2025-2596 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-2025-2596?

CVE-2025-2596 primarily affects Checkmk. In total, 146 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-2596?

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

Does CVE-2025-2596 have an EU (EUVD) identifier?

Yes. CVE-2025-2596 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-8123.

When was CVE-2025-2596 published?

CVE-2025-2596 was published on 2025-03-26 and last updated on 2026-06-17.

References

• https://checkmk.com/werk/17808

Affected products (146)

• cpe:2.3:a:checkmk:checkmk:*:*:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:-:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:b1:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:b2:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:b3:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:b4:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:b5:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:b6:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:b7:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:b8:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:b9:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:p1:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:p10:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:p11:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:p12:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:p13:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:p14:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:p15:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:p16:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:p17:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:p18:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:p19:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:p2:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:p20:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:p21:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:p22:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:p23:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:p24:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:p25:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:p26:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:p27:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:p28:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:p29:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:p3:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:p30:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:p31:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:p32:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:p33:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:p34:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.1.0:p35:*:*:*:*:*:*

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