What’s Vulnerable › Vulnerabilities

CVE-2021-28998

• Severity: high (CVSS 7.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-05-08 · updated 2026-06-17
• Weakness: CWE-434

Description

File upload vulnerability in CMS Made Simple through 2.2.15 allows remote authenticated attackers to gain a webshell via a crafted phar file.

Affected products

• CMS Made Simple: through 2.2.15

References

• https://github.com/beerpwn/CVE/blob/master/cms_made_simple_2021/file_upload_RCE/File_upload_to_RCE.md
• https://seclists.org/fulldisclosure/2021/Mar/50
• https://github.com/beerpwn/CVE/blob/master/cms_made_simple_2021/file_upload_RCE/File_upload_to_RCE.md
• https://seclists.org/fulldisclosure/2021/Mar/50

Get alerted when CVE-2021-28998 or the next vulnerability affects your stack