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.
References (3)
Core 3
Core References
Third Party Advisory x_refsource_misc
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39345
Exploit, Third Party Advisory x_refsource_misc
https://github.com/BigTiger2020/word-press/blob/main/HAL.md
Patch, Third Party Advisory x_refsource_misc
https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=2614075%40hal&new=2614075%40hal&sfp_email=&sfph_mail=
Scores
CVSS v3
5.5
EPSS
0.0060
EPSS Percentile
69.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-79
Status
published
Products (1)
cnrs/hal
< 2.1.1
Published
Oct 15, 2021
Tracked Since
Feb 18, 2026