Description
WordPress Plugin HAL is prone to a cross-site scripting vulnerability because it fails to properly sanitize user-supplied input. An attacker may leverage this issue to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site. This can allow the attacker to steal cookie-based authentication credentials and launch other attacks. WordPress Plugin HAL version 2.1.1 is vulnerable; prior versions may also be affected.
Remediation
Update to plugin version 2.2 or latest
References
https://github.com/BigTiger2020/word-press/blob/main/HAL.md
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39345
Related Vulnerabilities
Squid Improper Input Validation Vulnerability (CVE-2013-1839)
WordPress Plugin Livemesh Addons for Elementor Multiple Cross-Site Scripting Vulnerabilities (6.7.1)
MediaWiki Improper Access Control Vulnerability (CVE-2012-4380)
Caddy Web Server Improper Authentication Vulnerability (CVE-2026-52845)
WordPress Plugin Ocean Extra Cross-Site Request Forgery (1.6.5)