CVE-2021-47937
e107 CMS 2.3.0 Authenticated Remote Code Execution via Theme Upload
Description
e107 CMS 2.3.0 contains a remote code execution vulnerability that allows authenticated users with theme installation permissions to execute arbitrary commands by uploading malicious theme files. Attackers can upload a crafted theme package through the theme.php endpoint that deploys a web shell to the e107_themes directory, then execute system commands via the payload.php script.
INFO
Published Date :
May 10, 2026, 1:16 p.m.
Last Modified :
July 25, 2026, 10:10 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Limit users who can install themes.
- Review and update e107 CMS to the latest version.
- Remove any unauthorized themes or web shells.
- Monitor system for suspicious activity.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-47937.
| URL | Resource |
|---|---|
| https://e107.org/ | |
| https://e107.org/download | |
| https://www.exploit-db.com/exploits/50315 | |
| https://www.vulncheck.com/advisories/e107-cms-authenticated-remote-code-execution-via-theme-upload |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47937 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-47937
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-47937 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47937 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Jul. 25, 2026
Action Type Old Value New Value Changed Translation Title: e107 CMS de E107, Description: e107 CMS 2.3.0 contiene una vulnerabilidad de ejecución remota de código que permite a usuarios autenticados con permisos de instalación de temas ejecutar comandos arbitrarios mediante la carga de archivos de temas maliciosos. Los atacantes pueden cargar un paquete de tema manipulado a través del endpoint theme.PHP que despliega una web shell en el directorio e107_themes, y luego ejecutar comandos del sistema a través del script payload.PHP. Title: e107 CMS de E107, Description: e107 CMS 2.3.0 contiene una vulnerabilidad de ejecución remota de código que permite a usuarios autenticados con permisos de instalación de temas ejecutar comandos arbitrarios mediante la carga de archivos de temas maliciosos. Los atacantes pueden cargar un paquete de tema manipulado a través del endpoint theme.PHP que despliega una web shell en el directorio e107_themes, y luego ejecutar comandos del sistema a través del script payload.PHP. -
CVE Translated by [email protected]
Jul. 24, 2026
Action Type Old Value New Value Added Translation Title: e107 CMS de E107, Description: e107 CMS 2.3.0 contiene una vulnerabilidad de ejecución remota de código que permite a usuarios autenticados con permisos de instalación de temas ejecutar comandos arbitrarios mediante la carga de archivos de temas maliciosos. Los atacantes pueden cargar un paquete de tema manipulado a través del endpoint theme.PHP que despliega una web shell en el directorio e107_themes, y luego ejecutar comandos del sistema a través del script payload.PHP. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'E107', 'product': 'e107 CMS', 'versions': [{'status': 'affected', 'version': '2.3.0'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2021-47937', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-05-12T02:38:47.959169Z'} -
New CVE Received by [email protected]
May. 10, 2026
Action Type Old Value New Value Added Description e107 CMS 2.3.0 contains a remote code execution vulnerability that allows authenticated users with theme installation permissions to execute arbitrary commands by uploading malicious theme files. Attackers can upload a crafted theme package through the theme.php endpoint that deploys a web shell to the e107_themes directory, then execute system commands via the payload.php script. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-434 Added Reference https://e107.org/ Added Reference https://e107.org/download Added Reference https://www.exploit-db.com/exploits/50315 Added Reference https://www.vulncheck.com/advisories/e107-cms-authenticated-remote-code-execution-via-theme-upload