What’s Vulnerable › Vulnerabilities

CVE-2021-39345: HAL <= 2.1.1 Authenticated Stored Cross-Site Scripting

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-10-15 · updated 2026-06-17
• Weakness: CWE-79

Description

The HAL WordPress plugin is vulnerable to Stored Cross-Site Scripting due to insufficient input validation and sanitization via several parameters found in the ~/wp-hal.php file which allowed attackers with administrative user access to inject arbitrary web scripts, in versions up to and including 2.1.1. This affects multi-site installations where unfiltered_html is disabled for administrators, and sites where unfiltered_html is disabled.

Affected products

• HAL: through 2.1.1

References

• https://github.com/BigTiger2020/word-press/blob/main/HAL.md
• https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=2614075%40hal&new=2614075%40hal&sfp_email=&sfph_mail=
• https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39345
• https://github.com/BigTiger2020/word-press/blob/main/HAL.md
• https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=2614075%40hal&new=2614075%40hal&sfp_email=&sfph_mail=
• https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39345

Get alerted when CVE-2021-39345 or the next vulnerability affects your stack