CVE Explorer
CVE-2026-20915
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.
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"defaultStatus":"unaffected","product":"Checkmk","vendor":"Checkmk GmbH","versions":[{"lessThan":"2.5.0b2","status":"affected","version":"2.5.0b1","versionType":"semver"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:165ef30553b527a98fd1f6b716aa1db09e0e6e32176c84ee4543a56edff4f47f · sha256:9f689b61cf655b6a… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"baseScore":8.5,"baseSeverity":"HIGH","vectorString":"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","version":"4.0"},"metric_type":"cvssV4_0"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:165ef30553b527a98fd1f6b716aa1db09e0e6e32176c84ee4543a56edff4f47f · sha256:9f689b61cf655b6a… · /containers/cna/metrics/0/cvssV4_0
CWE assertions
1 source assertion{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:165ef30553b527a98fd1f6b716aa1db09e0e6e32176c84ee4543a56edff4f47f · sha256:9f689b61cf655b6a… · /containers/cna/problemTypes/0/descriptions/0
Source references
1 source assertion{"tags":["vendor-advisory"],"url":"https://checkmk.com/werk/19526"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:165ef30553b527a98fd1f6b716aa1db09e0e6e32176c84ee4543a56edff4f47f · sha256:9f689b61cf655b6a… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.