CVE-2026-53549 Termix: Server-Side Request Forgery via Proxy Connectivity Test
An authenticated user can exploit unvalidated proxy test endpoints to access internal networks and cloud metadata, potentially exposing sensitive credentials.
- 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-2026-53549?
CVE-2026-53549 is a high-severity server-side request forgery vulnerability in Termix-SSH Termix, published on 19 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Termix is a web-based server management platform with SSH terminal, tunneling, and file editing capabilities. Prior to 2.3.2, the POST /host/db/proxy/test endpoint accepts the singleProxy, proxyChain, and testTarget request fields without validating their destination addresses. The testProxyConnectivity path uses raw TCP and SOCKS connections to attacker-selected hosts and ports, allowing an authenticated user to probe localhost, private networks, link-local metadata services, and other infrastructure reachable from the Termix server. Structured connection errors disclose host reachability and timing information, and successful metadata access can expose cloud credentials. This issue is fixed in version 2.3.2.
Weakness: CWE-918
Which versions are affected by CVE-2026-53549?
How do I fix CVE-2026-53549?
No fix has been published for CVE-2026-53549 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-2026-53549 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-53549 exists.
Sources
Also known as GHSA-x9pr-795g-rm5f.