The Happyforms WordPress plugin before 1.22.0 does not validate and escape some of its block options before outputting them back in a page/post where the block is embed, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks.
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https://wpscan.com/vulnerability/b28150e7-214b-4bcd-85c0-e819c4223484 | exploit vdb entry third party advisory technical description |