Mysterium Network Mysterium Node up to 1.35.x Config User Endpoint /tequilapi/config/user improper authorization

Summaryinfo

A vulnerability has been found in Mysterium Network Mysterium Node up to 1.35.x and classified as critical. Impacted is an unknown function of the file /tequilapi/config/user of the component Config User Endpoint. This manipulation causes improper authorization. This vulnerability is tracked as CVE-2026-31309. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Mysterium Network Mysterium Node up to 1.35.x. It has been declared as critical. Affected by this vulnerability is an unknown part of the file /tequilapi/config/user of the component Config User Endpoint. The manipulation with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Improper authorization in the /tequilapi/config/user endpoint of Mysterium Node before v1.36.0 allows unauthenticated attackers to arbitrarily overwrite the node's configuration and achieve a full node takeover via supplying a crafted POST request.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-31309 since 03/09/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1548.002 according to MITRE ATT&CK.

Upgrading to version 1.36.0 eliminates this vulnerability.

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Productinfo

Vendor

• Mysterium Network

Name

• Mysterium Node

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20
• 1.21
• 1.22
• 1.23
• 1.24
• 1.25
• 1.26
• 1.27
• 1.28
• 1.29
• 1.30
• 1.31
• 1.32
• 1.33
• 1.34
• 1.35

CPE 2.3info

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CPE 2.2info

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