Description
WordPress Plugin WP Upload Restriction is prone to multiple vulnerabilities, including cross-site scripting and security bypass vulnerabilities. Exploiting these issues may allow an attacker to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site, to steal cookie-based authentication credentials, or to perform otherwise restricted actions and subsequently delete custom extensions. WordPress Plugin WP Upload Restriction version 2.2.3 is vulnerable; prior versions may also be affected.
Remediation
Update to plugin version 2.2.8 or latest
References
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-34625
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-34626
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-34627
https://plugins.svn.wordpress.org/wp-upload-restriction/trunk/readme.txt