What’s Vulnerable › Vulnerabilities

CVE-2021-28976

• Severity: high (CVSS 7.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 7.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-06-23 · updated 2026-06-17
• Weakness: CWE-434

Description

Remote Code Execution vulnerability in GetSimpleCMS before 3.3.16 in admin/upload.php via phar filess.

Affected products

• GetSimpleCMS: before 3.3.15 — fixed in 3.3.15

How to fix

Upgrade to a fixed version: GetSimpleCMS 3.3.15. Check the vendor advisory for mitigations.

References

• https://github.com/GetSimpleCMS/GetSimpleCMS/issues/1335
• https://github.com/GetSimpleCMS/GetSimpleCMS/issues/1335

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