CVE-2021-42839: Grand Vice info Co. webopac7 - Arbitrary File Upload

Severity: critical (CVSS 9.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-11-15 · updated 2026-06-17
Weakness: CWE-434

Description

Grand Vice info Co. webopac7 file upload function fails to filter special characters. While logging in with general user’s permission, remote attackers can upload malicious script and execute arbitrary code to control the system or interrupt services.

Affected products

Grand Vice info Webopac: 1.8.20160701, 7.1.20160701

References

https://www.twcert.org.tw/tw/cp-132-5288-9d546-1.html
https://www.twcert.org.tw/tw/cp-132-5288-9d546-1.html

Get alerted when CVE-2021-42839 or the next vulnerability affects your stack