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Werk #22663: Check HTML form submit: Fix form selection and submission

Component Checks & agents
Title Check HTML form submit: Fix form selection and submission
Date Oct 8, 2026
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed
Checkmk versions & editions
3.0.0b1
Not yet released
Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

The active check Check HTML form submit had several bugs when selecting and submitting a form:

  • With exactly one form on the page and Name of the form to populate and submit configured, the check went CRIT although the name matched, and submitted the form if the name did not match.
  • An absolute URL as form action was appended to the page's directory, and an empty action made the check crash.
  • An absolute path as form action, e.g. /login, referred to the monitored host instead of the host the page was loaded from after redirects.
  • For forms with method GET, the query of the form's action (or of the page URL if there is no action) is now replaced by the form data, as a browser does. Before, the form data was appended to that query.
  • Input fields like <input name="token" value> were submitted with the value None instead of an empty value.
  • A method or name attribute without a value in the form tag could make the check crash.

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