The Custom Related Posts plugin for WordPress is vulnerable to unauthorized access & modification of data due to a missing capability check on three AJAX actions in all versions up to, and including, 1.7.3. This makes it possible for authenticated attackers, with Subscriber-level access and above, to search posts and link/unlink relations.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
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