CVE-2026-121509: Headless CMS Plugin REST API post get_required_post_data information disclosure

A security flaw has been discovered in Headless CMS Plugin up to 2.0.4 on WordPress. This affects the function getrequiredpostdata of the file /wp-json/rae/v1/post of the component REST API. The manipulation of the argument postid/postslug results in information disclosure. The attack may be launched remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.