CVE-2026-8833
XSS in urls
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-79 |
| Vendor | checkmk gmbh |
| Product | checkmk |
| Published | Jun 8, 2026 |
| Last Updated | Jun 8, 2026 |
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Affected Versions
Checkmk GmbH / Checkmk
2.5.0 < 2.5.0p5 2.4.0 < 2.4.0p31 2.3.0 < 2.3.0p48 2.2.0
Credits
🔍 Arvato Systems Offensive Security