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CVE-2026-31309

Critical

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.

SeverityCritical
CVSS9.8
Exploit probability—
ProductNode
PublishedJul 8, 2026
First seenJul 8, 2026
Weakness typeCWE-862Missing authorization

How to fix

Update
  • Mysterium Node1.36.0 or later

Affected products

ProductAffected versionsFixed in
Mysterium Node1.21.1-rc0 ≤ v1.36.0

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