CVE-2021-39345

Public Exploit
HAL <= 2.1.1 Authenticated Stored Cross-Site Scripting

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.

Remediation

Solution:

  • Uninstall plugin from WordPress site.

Category

5.5
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.41%
Third-Party Advisory github.com Third-Party Advisory wordpress.org Third-Party Advisory wordfence.com
Affected: HAL HAL
Published at:
Updated at:

References

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

Frequently Asked Questions

What is the severity of CVE-2021-39345?
CVE-2021-39345 has been scored as a medium severity vulnerability.
How to fix CVE-2021-39345?
To fix CVE-2021-39345: Uninstall plugin from WordPress site.
Is CVE-2021-39345 being actively exploited in the wild?
It is possible that CVE-2021-39345 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-39345?
CVE-2021-39345 affects HAL HAL.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.