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CVE-2026-8833 Details
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.
A cross-site scripting (XSS) vulnerability has been identified in Checkmk versions 2.5.0 prior to 2.5.0p5, 2.4.0 prior to 2.4.0p31, 2.3.0 prior to 2.3.0p48, and all 2.2.0 versions. The issue arises from improper handling of HTML-encoded characters in the URL validation function, allowing authenticated users to bypass URL validation and inject malicious URLs, such as 'javascript:' URIs. This injection can lead to XSS when another user interacts with the crafted link.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jun 8, 2026Exploitation: NoneAutomatable: NoTechnical Impact: Total
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://checkmk.com/werk/20002 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| checkmk checkmk | 2.2.0 - 2.2.0 b1 2.2.0 b2 2.2.0 b3 2.2.0 b4 2.2.0 b5 2.2.0 b6 2.2.0 b7 2.2.0 b8 2.2.0 i1 2.2.0 p1 2.2.0 p10 2.2.0 p11 2.2.0 p12 2.2.0 p13 2.2.0 p14 2.2.0 p15 2.2.0 p16 2.2.0 p17 2.2.0 p18 2.2.0 p19 2.2.0 p2 2.2.0 p20 2.2.0 p21 2.2.0 p22 2.2.0 p23 2.2.0 p24 2.2.0 p25 2.2.0 p26 2.2.0 p27 2.2.0 p28 2.2.0 p29 2.2.0 p3 2.2.0 p30 2.2.0 p31 2.2.0 p32 2.2.0 p33 2.2.0 p34 2.2.0 p35 2.2.0 p36 2.2.0 p37 2.2.0 p38 2.2.0 p39 2.2.0 p4 2.2.0 p40 2.2.0 p41 2.2.0 p42 2.2.0 p43 2.2.0 p44 2.2.0 p45 2.2.0 p46 2.2.0 p47 2.2.0 p5 2.2.0 p6 2.2.0 p7 2.2.0 p8 2.2.0 p9 2.3.0 - 2.3.0 b1 2.3.0 b2 2.3.0 b3 2.3.0 b4 2.3.0 b5 2.3.0 b6 2.3.0 p1 2.3.0 p10 2.3.0 p11 2.3.0 p12 2.3.0 p13 2.3.0 p14 2.3.0 p15 2.3.0 p16 2.3.0 p17 2.3.0 p18 2.3.0 p19 2.3.0 p2 2.3.0 p20 2.3.0 p21 2.3.0 p22 2.3.0 p23 2.3.0 p24 2.3.0 p25 2.3.0 p26 2.3.0 p27 2.3.0 p28 2.3.0 p29 2.3.0 p3 2.3.0 p30 2.3.0 p31 2.3.0 p32 2.3.0 p33 2.3.0 p34 2.3.0 p35 2.3.0 p36 2.3.0 p37 2.3.0 p38 2.3.0 p39 2.3.0 p4 2.3.0 p40 2.3.0 p41 2.3.0 p42 2.3.0 p43 2.3.0 p44 2.3.0 p45 2.3.0 p46 2.3.0 p47 2.3.0 p5 2.3.0 p6 2.3.0 p7 2.3.0 p8 2.3.0 p9 2.4.0 2.4.0 - 2.4.0 b1 2.4.0 b2 2.4.0 b3 2.4.0 b4 2.4.0 b5 2.4.0 b6 2.4.0 p1 2.4.0 p10 2.4.0 p11 2.4.0 p12 2.4.0 p13 2.4.0 p14 2.4.0 p15 2.4.0 p16 2.4.0 p17 2.4.0 p18 2.4.0 p19 2.4.0 p2 2.4.0 p20 2.4.0 p21 2.4.0 p22 2.4.0 p23 2.4.0 p24 2.4.0 p25 2.4.0 p26 2.4.0 p27 2.4.0 p28 2.4.0 p29 2.4.0 p3 2.4.0 p30 2.4.0 p4 2.4.0 p5 2.4.0 p6 2.4.0 p7 2.4.0 p8 2.4.0 p9 2.5.0 - 2.5.0 b1 2.5.0 b2 2.5.0 b3 2.5.0 p1 2.5.0 p2 2.5.0 p3 2.5.0 p4 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 23, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 9, 2026 | Initial Analysis | [email protected] |
| Jun 8, 2026 | New CVE Received | [email protected] |