CVE-2026-8833

HIGH EPSS 3.8%
Published Jun 8, 20263w ago · Modified Jun 17, 20261w ago
8.5 CVSS 4.0
High
Find Similar
Published Jun 8, 2026 3w ago
Last Modified Jun 17, 2026 1w ago

Description

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.

CVSS Details

Base Score
8.5
Exploitability
—
Impact
—
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction A
Scope X

Threat Intelligence

EPSS Exploit Probability
3.8% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-79 Cross-site Scripting Injection

Affected Products 157

VendorProductVersionRange
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.5.0any
checkmkcheckmk2.5.0any
checkmkcheckmk2.5.0any
checkmkcheckmk2.5.0any
checkmkcheckmk2.5.0any
checkmkcheckmk2.5.0any
checkmkcheckmk2.5.0any
checkmkcheckmk2.5.0any

References 1

  • checkmk.com https://checkmk.com/werk/20002
    Vendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.