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.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00345.

Exploitation poc

Automatable yes

Technical Impact partial

Affected Vendors & Products

No data.

No data.

No data.

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Vendors Products
References
Link Providers
https://github.com/mysteriumnetwork/node/ cve-icon
https://github.com/mysteriumnetwork/node/blob/1.35.5/tequilapi/tequil/routes.go#L26 cve-icon
https://github.com/mysteriumnetwork/node/commit/83051199cd641dd4ed9057b958e5616df1309f19 cve-icon
https://github.com/mysteriumnetwork/node/commit/bc099fcaff59fee9c8a8f8e07ffff5b3c5df2bb9 cve-icon
https://github.com/mysteriumnetwork/node/releases/tag/1.35.5 cve-icon
https://github.com/mysteriumnetwork/node/releases/tag/1.36.0 cve-icon
https://github.com/sch8ill/CVE-2026-31309 cve-icon cve-icon
History

Thu, 09 Jul 2026 16:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-862
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 09 Jul 2026 04:45:00 +0000

Type Values Removed Values Added
Title Unauthorized configuration overwrite via /tequilapi/config/user endpoint
Weaknesses CWE-284

Wed, 08 Jul 2026 22:15:00 +0000

Type Values Removed Values Added
Description 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.
References
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-07-09T14:31:28.157Z

Reserved: 2026-03-09T00:00:00.000Z

Link: CVE-2026-31309

cve-icon Vulnrichment

Updated: 2026-07-09T14:31:10.556Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-09T04:30:13Z