CVE-2021-28976
Remote Code Execution vulnerability in GetSimpleCMS before 3.3.16 in admin/upload.php via phar filess.
Does this matter?
A public exploit is published in Exploit-DB and the impact is high, while EPSS rates exploitation at 7.5%. Anyone can run this; patch or mitigate before the next change window and check exposed instances for signs of use.
Description
Remote Code Execution vulnerability in GetSimpleCMS before 3.3.16 in admin/upload.php via phar filess.
- CVSS 3.1
- 7.2 HIGHCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 7.55% probability · 94th percentile
- Public exploits
- 1 in Exploit-DB · first 11 April 2025
- CISA KEV
- Not listed
- Weakness
- CWE-434
- Affected
- get-simple/getsimplecms
- Source
- cve@mitre.org
EPSS 7.5% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
Public exploits (1)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
References
- https://github.com/GetSimpleCMS/GetSimpleCMS/issues/1335Third Party Advisory
- https://github.com/GetSimpleCMS/GetSimpleCMS/issues/1335Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.