CVE Explorer

CVE-2026-8833

Improper neutralization of HTML-encoded characters in the URL validation function in Checkmk <2.5.0p5, <2.4.0p31, <2.3.0p48, and all 2.2.0 versions allows an authenticated user to bypass URL validation and inject malicious URLs such as javascript: URIs, resulting in cross-site scripting when another user interacts with the crafted link.

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:582651aea5e9d8f9c37a31996fd25b1650bf305776c4e9a6cfa63afeee23dbed

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"defaultStatus":"unaffected","product":"Checkmk","vendor":"Checkmk GmbH","versions":[{"lessThan":"2.5.0p5","status":"affected","version":"2.5.0","versionType":"semver"},{"lessThan":"2.4.0p31","status":"affected","version":"2.4.0","versionType":"semver"},{"lessThan":"2.3.0p48","status":"affected","version":"2.3.0","versionType":"semver"},{"status":"affected","version":"2.2.0","versionType":"semver"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:27d206a9a4eff0eccfd3809fd1ec87cfb94b2dbc5057bd5b52dd6e06b8baa828 · sha256:346eadff728eb2cb… · /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:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:L/SA:N","version":"4.0"},"metric_type":"cvssV4_0"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:27d206a9a4eff0eccfd3809fd1ec87cfb94b2dbc5057bd5b52dd6e06b8baa828 · sha256:346eadff728eb2cb… · /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_v5cwe
urn:baitaphish:normalized-source-record:v2:27d206a9a4eff0eccfd3809fd1ec87cfb94b2dbc5057bd5b52dd6e06b8baa828 · sha256:346eadff728eb2cb… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion

{"tags":["vendor-advisory"],"url":"https://checkmk.com/werk/20002"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:27d206a9a4eff0eccfd3809fd1ec87cfb94b2dbc5057bd5b52dd6e06b8baa828 · sha256:346eadff728eb2cb… · /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.

← Back to CVE Explorer