Auth bypass in Hashicorp Consul
CVE-2026-87090
Consul and Consul Enterprise are vulnerable to an authorization bypass in the catalog node-write path that may allow an authenticated attacker to delete another node's catalog registration and take over its node identity. An attacker with a token granting node-write permission on any single node name may exploit this issue if they can obtain the node ID of a node they do not control. This vulnerability (CVE-2026-87090) is fixed in Consul 2.0.4 and Consul Enterprise 1.21.18, 1.22.12 and 2.0.4.
Vulnerability class: Broken Access Control
CVSS v3 metric
CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H.
Affected products
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-87090?
- CVE-2026-87090 is a high-severity vulnerability in Hashicorp Consul, classified under Incorrect Authorization. CVSS score: 8.3/10. Published 2026-09-10.
- How severe is CVE-2026-87090?
- High severity. CVSS v3 base score is 8.3 out of 10.