CVE-2021-47958 CouchCMS 2.2.1 Server-Side Request Forgery via SVG upload
Authenticated attackers can exploit an SSRF vulnerability in CouchCMS by uploading malicious SVG files to access internal services and resources.
- 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-2021-47958?
CVE-2021-47958 is a medium-severity server-side request forgery vulnerability in CouchCMS, published on 15 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
CouchCMS 2.2.1 contains a server-side request forgery vulnerability that allows authenticated attackers to make arbitrary HTTP requests by uploading malicious SVG files. Attackers can upload SVG files containing external entity references through the browse.php endpoint to access internal services and resources.
Weakness: CWE-918
Which versions are affected by CVE-2021-47958?
How do I fix CVE-2021-47958?
No fix has been published for CVE-2021-47958 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-2021-47958 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47958 exists.
Sources
Also known as GHSA-c329-4cx6-v738.