CheckMK Raw Edition software (versions 1.5.0 to 1.6.0) does not sanitise the input of a web service parameter that is in an unauthenticated zone. This Reflected XSS allows an attacker to open a backdoor on the device with HTML content and interpreted by the browser (such as JavaScript or other client-side scripts) or to steal the session cookies of a user who has previously authenticated via a man in the middle. Successful exploitation requires access to the web service resource without authentication.

In Checkmk <=2.0.0p19 fixed in 2.0.0p20 and Checkmk <=1.6.0p27 fixed in 1.6.0p28, the title of a Predefined condition is not properly escaped when shown as condition, which can result in Cross Site Scripting (XSS).

Checkmk <=2.0.0p19 Fixed in 2.0.0p20 and Checkmk <=1.6.0p27 Fixed in 1.6.0p28 are affected by a Cross Site Scripting (XSS) vulnerability. The Alias of a site was not properly escaped when shown as condition for notifications.

A stored cross site scripting (XSS) vulnerability in Checkmk 1.6.0x prior to 1.6.0p19 allows an authenticated remote attacker to inject arbitrary JavaScript via a javascript: URL in a view title.

Checkmk before 1.6.0p17 allows local users to obtain SYSTEM privileges via a Trojan horse shell script in the %PROGRAMDATA%\checkmk\agent\local directory.