CVE-2026-8833— XSS in urls
Possible ATT&CK Techniques 1AI
T1068 · Exploitation for Privilege EscalationAffected Version Matrix 4
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Checkmk GmbH | Checkmk | 2.5.0< 2.5.0p5 | affected |
2.4.0< 2.4.0p31 | affected | ||
2.3.0< 2.3.0p48 | affected | ||
2.2.0 | affected |
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I. Basic Information for CVE-2026-8833
Vulnerability Information
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Vulnerability Title
XSS in urls
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Checkmk 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Checkmk是Checkmk公司的一个 IT 监控平台。 Checkmk 2.5.0p5之前版本、2.4.0p31之前版本、2.3.0p48之前版本和所有2.2.0版本存在跨站脚本漏洞，该漏洞源于URL验证函数中HTML编码字符的中和不当，允许经过身份验证的用户绕过URL验证并注入恶意URL如javascript: URI，导致其他用户与特制链接交互时发生跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Checkmk GmbH | Checkmk | 2.5.0 ~ 2.5.0p5 | - |
II. Public POCs for CVE-2026-8833
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-8833 (1)
- 🔗 Werk #20002: XSS in urlsvendor-advisory
Same Patch Batch · Checkmk GmbH · 2026-06-08 · 5 CVEs total
| CVE-2026-7186 | Fix stored XSS in URL dashboard widget via dangerous URI schemes | |
| CVE-2026-7765 | User Messages widget leaked issuer messages on shared dashboards | |
| CVE-2026-9549 | Fix XSS in service discovery active check output | |
| CVE-2026-8078 | Fix stored XSS in global settings change log |
IV. Related Vulnerabilities
Same product: Checkmk
- CVE-2026-9549
Fix XSS in service discovery active check output - CVE-2026-8078
Fix stored XSS in global settings change log - CVE-2026-7765
User Messages widget leaked issuer messages on shared dashbo - CVE-2026-7186
Fix stored XSS in URL dashboard widget via dangerous URI sch - CVE-2024-47091
Privilege escalation via mk_mysql agent plugin on Windows
Same vendor: Checkmk GmbH
- CVE-2026-9549
Fix XSS in service discovery active check output - CVE-2026-8078
Fix stored XSS in global settings change log - CVE-2026-7765
User Messages widget leaked issuer messages on shared dashbo - CVE-2026-7186
Fix stored XSS in URL dashboard widget via dangerous URI sch - CVE-2024-47091
Privilege escalation via mk_mysql agent plugin on Windows
Same weakness: CWE-79
- CVE-2026-47646
Dynamics 365 Customer Voice Spoofing Vulnerability - CVE-2026-5922
Poly Voice – Potential Unauthorized Modification of WebUI us - CVE-2026-55877
Symfony UX: XSS in symfony/ux-icons via unsanitized SVG cont - CVE-2026-54527
JupyterLab Git: Stored XSS leading to RCE - CVE-2026-58191
Appium: Reflected XSS / arbitrary JS in @appium/base-driver
V. Comments for CVE-2026-8833
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