CVE-2019-20872 Server-side request forgery in n/a
Attackers can exploit Server-Side Request Forgery in Mattermost Server to access internal local services.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2019-20872?
CVE-2019-20872 is a medium-severity server-side request forgery vulnerability in Mattermost Mattermost Server, published on 19 Jun 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
An issue was discovered in Mattermost Server before 5.9.0, 5.8.1, 5.7.3, and 4.10.8. SSRF can attack local services.
Weakness: CWE-918
Which versions are affected by CVE-2019-20872?
It affects 1 product.
Products include Mattermost Mattermost Server.
How do I fix CVE-2019-20872?
No fix has been published for CVE-2019-20872 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-2019-20872 being exploited?
There is no known exploitation of CVE-2019-20872 in the wild and no public exploit code.
Other vulnerabilities in Mattermost Mattermost Server
- CVE-2025-12419 Account takeover on OAuth/OpenID-enabled servers
- CVE-2025-12421 Account Takeover via Code Exchange Endpoint
- CVE-2025-4981 Path Traversal Leading to RCE by Any Authenticated Mattermost User
- CVE-2025-20051 Arbitrary file read via block duplication in Mattermost Boards
- CVE-2025-25279 Arbitrary file read in Mattermost Boards via import & export board archive
Sources
Also known as GHSA-ff4w-g37q-gw56.