CVE-2021-28428
high-risk
Published 2022-04-05
File upload vulnerability in HorizontCMS before 1.0.0-beta.3 via uploading a .htaccess and *.hello files using the Media Files upload functionality. The original file upload vulnerability (CVE-2020-27387) was remediated by restricting the PHP extensions; however, we confirmed that the filter was bypassed via uploading an arbitrary .htaccess and *.hello files in order to execute PHP code to gain RCE.
Do I need to act?
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0.43% chance of exploitation
EPSS score — low exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.8/10
Critical
NETWORK
/ LOW complexity
Affected Products (11)
Horizontcms
Horizontcms
Horizontcms
Horizontcms
Horizontcms
Horizontcms
Horizontcms
Horizontcms
Horizontcms
Horizontcms
Horizontcms
Affected Vendors
50
/ 100
high-risk
Severity
32/34 · Critical
Exploitability
2/34 · Minimal
Exposure
16/34 · Moderate