CVE-2021-40109 Server-side request forgery in n/a
Attackers with upload permissions can exploit SSRF to access internal network resources and upload disallowed file types via URL redirects.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-40109?
CVE-2021-40109 is a medium-severity server-side request forgery vulnerability in Concretecms Concrete Cms, published on 27 Sep 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A SSRF issue was discovered in Concrete CMS through 8.5.5. Users can access forbidden files on their local network. A user with permissions to upload files from external sites can upload a URL that redirects to an internal resource of any file type. The redirect is followed and loads the contents of the file from the redirected-to server. Files of disallowed types can be uploaded.
Weakness: CWE-918
Which versions are affected by CVE-2021-40109?
It affects 1 product.
Products include Concretecms Concrete Cms.
How do I fix CVE-2021-40109?
No fix has been published for CVE-2021-40109 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2021-40109 being exploited?
There is no known exploitation of CVE-2021-40109 in the wild and no public exploit code.
Other vulnerabilities in Concretecms Concrete Cms
- CVE-2023-48648 Concrete CMS allows unauthorized access because directories can be created with insecure permissions
- CVE-2022-21829 Code injection in concrete CMS
- CVE-2021-22958 Server-Side Request Forgery vulnerability in concrete5
- CVE-2021-40098 Path traversal in n/a
- CVE-2026-8134 Concrete CMS Vulnerable to Relative Path Traversal
Sources
Also known as GHSA-mm62-vxgq-v5v9.