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
WordPress Plugin Local Market Explorer 'api-key' Parameter Cross-Site Scripting (3.1.1)
WordPress Plugin Event Calendar WD-Responsive Event Calendar Cross-Site Scripting (1.1.23)
WordPress Plugin Contact Form 7 Arbitrary File Upload (5.3.1)
TYPO3 URL Redirection to Untrusted Site ('Open Redirect') Vulnerability (CVE-2021-21338)
Oracle HTTP Server NULL Pointer Dereference Vulnerability (CVE-2021-34798)