What is CVE-2026-31309?

CVE-2026-31309 is a high-severity vulnerability in N/a, classified under Missing Authorization. CVSS score: 7.5/10. Published 2026-07-08.

How severe is CVE-2026-31309?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2026-31309 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Auth bypass in N/a

CVE-2026-31309

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…

Vulnerability class: Broken Access Control

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

N/a — versions n/a

Weakness classification (CWE)

CWE-862 — Missing Authorization

Public proof-of-concept exploits

Sch8ill/CVE-2026-31309

References

Frequently asked questions

What is CVE-2026-31309?: CVE-2026-31309 is a high-severity vulnerability in N/a, classified under Missing Authorization. CVSS score: 7.5/10. Published 2026-07-08.
How severe is CVE-2026-31309?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2026-31309 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.