CVE-2026-20915

8.5 highEPSS 0.2%

High (8.5) in checkmk checkmk. EPSS 0.2% chance of exploitation in the next 30 days.

Stored cross-site scripting (XSS) in Checkmk version 2.5.0 (beta) before 2.5.0b2 allows authenticated users with permission to create pending changes to inject malicious JavaScript into the Pending Changes sidebar, which will execute in the browsers of other users viewing the sidebar.

Severity

CVSS 4.0

8.5 high

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:L/SA:N

CVSS 3.1

5.4 medium

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS: 0.2% chance of exploitation in the next 30 days; higher than 4% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2026-03-31
Modified: 2026-07-25
Record from: the NVD, synced 2026-10-19

Affected

checkmk:checkmk

References

https://checkmk.com/werk/19526

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