What is CVE-2026-53676?

CVE-2026-53676 is a high-severity vulnerability in Thingsboard, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 7.2/10. Published 2026-06-17.

How severe is CVE-2026-53676?

High severity. CVSS v3 base score is 7.2 out of 10.

Prototype Pollution in Thingsboard

CVE-2026-53676

ThingsBoard contains a prototype pollution vulnerability which may lead to arbitrary code execution within a sandboxed context by a user who can log in to the affected product with the tenant administrator privilege (TENANT_ADMIN).

Vulnerability class: Prototype Pollution

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

Affected products

Thingsboard — versions prior to v4.3.1.2

Weakness classification (CWE)

CWE-1321 — Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution)

References

vultures@jpcert.or.jp
vultures@jpcert.or.jp
vultures@jpcert.or.jp

Frequently asked questions

What is CVE-2026-53676?: CVE-2026-53676 is a high-severity vulnerability in Thingsboard, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 7.2/10. Published 2026-06-17.
How severe is CVE-2026-53676?: High severity. CVSS v3 base score is 7.2 out of 10.