changedetection.io has a Server Side Template Injection using Jinja2 which allows Remote Command Execution
Summary
A Server Side Template Injection in changedetection.io caused by usage of unsafe functions of Jinja2 allows Remote Command Execution on the server host.
Details
changedetection.io version: 0.45.20
docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
dgtlmoon/changedetection.io latest 53529c2e69f1 44 hours ago 423MBThe vulnerability is caused by the usage of vulnerable functions of Jinja2 template engine.
from jinja2 import Environment, BaseLoader
...
# Get the notification body from datastore
jinja2_env = Environment(loader=BaseLoader)
n_body = jinja2_env.from_string(n_object.get('notification_body', '')).render(**notification_parameters)
n_title = jinja2_env.from_string(n_object.get('notification_title', '')).render(**notification_parameters)PoC
- Create/Edit a URL watch item
- Under Notifications tab insert this payload:
{{ self.__init__.__globals__.__builtins__.__import__('os').popen('id').read() }}- See Telegram (or other supported messaging app) notification
Impact
In the PoC I've used id as payload and Telegram to read the result.
Attackers can run any system command without any restriction and they don't need to read the result in the notification app (e.g. they could use a reverse shell).
The impact is critical as the attacker can completely takeover the server host.
This can be reduced if changedetection access is protected by login page with a password, but this isn't required by the application (not by default and not enforced).
References
- https://www.hacktivesecurity.com/blog/2024/05/08/cve-2024-32651-server-side-template-injection-changedetection-io/
- https://book.hacktricks.xyz/pentesting-web/ssti-server-side-template-injection/jinja2-ssti
- https://www.onsecurity.io/blog/server-side-template-injection-with-jinja2/
- https://docs.cobalt.io/bestpractices/prevent-ssti/
Credits
Edoardo Ottavianelli
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Python (PyPI) | changedetection-io | < 0.45.21 | 0.45.21 |
Referencias
- https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-4r7v-whpg-8rx3
- https://nvd.nist.gov/vuln/detail/CVE-2024-32651
- https://blog.hacktivesecurity.com/index.php/2024/05/08/cve-2024-32651-server-side-template-injection-changedetection-io
- https://github.com/dgtlmoon/changedetection.io
- https://github.com/dgtlmoon/changedetection.io/releases/tag/0.45.21
- https://www.onsecurity.io/blog/server-side-template-injection-with-jinja2
- https://pypi.org/project/changedetection-io
- https://github.com/advisories/GHSA-4r7v-whpg-8rx3
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H- Debilidad (CWE)
CWE-1336- Plataforma
- Python (PyPI)
- Paquete
changedetection-io- Publicada
- 15.10.2024
- Actualizado
- 11.10.2026 15:17
Fuentes y licencias
OSV / GitHub Advisory Database - PYSEC-2026-310 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-4r7v-whpg-8rx3 - CC BY 4.0
Historial de vulnerabilidades: changedetection-io
Todas las vulnerabilidades publicadas de este paquete (Python (PyPI)), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 20
- Primera → última
- 02.2023 05.2026
- Sin corrección
- 1
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 2
- Alta 9
- Media 6
- Baja 2
- Sin evaluar 1
Divulgaciones por año
- 2023: 1
- 2024: 6
- 2025: 2
- 2026: 11
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changedetection.io has a Server Side Template Injection using Jinja2 which allows Remote Command Execution esta entrada
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