CVE-2021-28976
Remote Code Execution vulnerability in GetSimpleCMS before 3.3.16 in admin/upload.php via phar...
Remote Code Execution vulnerability in GetSimpleCMS before 3.3.16 in admin/upload.php via phar filess.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- High
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
Remote Code Execution vulnerability in GetSimpleCMS before 3.3.16 in admin/upload.php via phar filess.
- Record
CVE-2021-28976- CVSS 3.1
- 7.2 High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 6.5 Medium
AV:N/AC:L/Au:S/C:P/I:P/A:P - Weakness
- CWE-434
- Updated
- 2026-11-02
CVE List No score
Remote Code Execution vulnerability in GetSimpleCMS before 3.3.16 in admin/upload.php via phar filess.
- Record
CVE-2021-28976- Updated
- 2026-11-02
EUVDEUVD-2021-15623 No score
Remote Code Execution vulnerability in GetSimpleCMS before 3.3.16 in admin/upload.php via phar filess.
- Record
EUVD-2021-15623- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-g2wx-83fr-2mf4 No score
Remote Code Execution vulnerability in GetSimpleCMS before 3.3.16 in admin/upload.php via phar...
Remote Code Execution vulnerability in GetSimpleCMS before 3.3.16 in admin/upload.php via phar filess.
- Record
GHSA-g2wx-83fr-2mf4- Weakness
- CWE-434
- Updated
- 2026-11-02
OSV
Remote Code Execution vulnerability in GetSimpleCMS before 3.3.16 in admin/upload.php via phar filess.
- Record
CVE-2021-28976- CVSS 3.1
- 7.2 High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| Exploit-DB | GetSimpleCMS 3.3.16 - Remote Code Execution (RCE) | 2025-04-11 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, Exploit-DB, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-28976 is a high vulnerability (CVSS 7.2) in Get-simple Getsimplecms, published June 23, 2021. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 7.55%, the 94th percentile. No source names a fixed version.