CVE-2026-31309

Summary

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.

Affected Software

Weaknesses

• n/a

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: yes
  • Technical Impact: partial

Additional References

• https://github.com/sch8ill/CVE-2026-31309

References

• https://github.com/mysteriumnetwork/node/
• https://github.com/mysteriumnetwork/node/blob/1.35.5/tequilapi/tequil/routes.go#L26
• https://github.com/mysteriumnetwork/node/commit/83051199cd641dd4ed9057b958e5616df1309f19
• https://github.com/mysteriumnetwork/node/commit/bc099fcaff59fee9c8a8f8e07ffff5b3c5df2bb9
• https://github.com/mysteriumnetwork/node/releases/tag/1.35.5
• https://github.com/mysteriumnetwork/node/releases/tag/1.36.0
• https://github.com/sch8ill/CVE-2026-31309

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