CVE-2026-31309 Missing authorization in n/a
Unauthenticated attackers can overwrite node configuration via the /tequilapi/config/user endpoint, leading to full node takeover.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-31309?
CVE-2026-31309 is a critical missing authorization vulnerability in n/a, published on 8 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Improper authorization in the /tequilapi/config/user endpoint of Mysterium Node from v1.21.1-rc0 before v1.36.0 allows an unauthenticated attacker to arbitrarily overwrite the node's configuration and achieve a full node takeover via a crafted POST request.
Weakness: CWE-862
Which versions are affected by CVE-2026-31309?
How do I fix CVE-2026-31309?
No fix has been published for CVE-2026-31309 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-31309 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-31309 exists.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-p7gf-g6r8-g65h.