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Vulnerability record · CVE-2026-31309 · published 8 July 2026

CVE-2026-31309: Missing authorization vulnerability

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.

9.8 CVSS 3.1 Critical EPSS 0.62% · top 52.4% CWE-862 · Missing authorization Deferred
9.8CVSS 3.1 base score
0.62%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
16 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

LinkTags
https://github.com/mysteriumnetwork/node/
https://github.com/mysteriumnetwork/node/commit/bc099fcaff59fee9c8a8f8e07ffff5b3c5df2bb9
https://github.com/sch8ill/CVE-2026-31309
https://github.com/sch8ill/CVE-2026-31309

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Source: NIST National Vulnerability Database (record CVE-2026-31309), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.