Google search console is showing hundreds of thousands of pages of site search spam. Most of these are non-indexed but more than 55,000 are 'indexed but blocked by robots.txt'.
The links have clearly all been created by adding queries to our search bar, and are providing links to gambling websites.
Our traffic has been decreasing over the last couple of weeks and I am concerned that it is related to this. I have only just noticed this in search console but this has been ongoing for the last couple of months.
Having done lots of research this evening, most of the suggestions to fix the problem can only be achieved by having a Wordpress site but as we have no access to robots.txt file or telling Google not to index certain pages, I am at a complete loss as to what to do and am desperately hoping that someone may be able to help.
We have removed the search bar off our site this evening in the hopes of preventing any more links being created, but as a very large travel blog, this is far from ideal.