CVE-2026-7186 Fix stored XSS in URL dashboard widget via dangerous URI schemes
Stored XSS in Checkmk allows attackers with dashboard edit rights to execute scripts in other users' browsers via malicious URLs.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-7186?
CVE-2026-7186 is a high-severity cross-site scripting vulnerability in Checkmk Checkmk, published on 8 Jun 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Stored cross-site scripting in the URL dashboard widget in Checkmk <2.5.0p5, <2.4.0p31, <2.3.0p48, and all 2.2.0 versions allows a user with dashboard editing permissions to store a URL with a dangerous URI scheme such as javascript: that executes scripts in other users' browsers when they view the dashboard.
Weakness: CWE-79
Which versions are affected by CVE-2026-7186?
It affects 1 product.
Products include Checkmk Checkmk.
How do I fix CVE-2026-7186?
No fix has been published for CVE-2026-7186 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-7186 being exploited?
There is no known exploitation of CVE-2026-7186 in the wild and no public exploit code.
Other vulnerabilities in Checkmk Checkmk
- CVE-2025-39666 omd: Local privilege escalation when executing omd commands as root
- CVE-2024-8606 Fix 2FA bypass via RestAPI
- CVE-2022-46836 PHP code injection in watolib
- CVE-2025-32919 Privilege Escalation in Windows License plugin for Checkmk Windows Agent
- CVE-2024-28827 Privilege escalation in Windows agent
Sources
Also known as GHSA-6f3j-vw42-8645, UBUNTU-CVE-2026-7186.