CVE-2026-87090 Consul - Authorization Bypass

Consul and Consul Enterprise contain an authorization bypass caused by improper access control in the catalog node-write path, letting authenticated attackers delete other nodes' catalog registrations and take over node identities, exploit requires node-write permission and knowledge of target node ID.

CVSS base score 8.3 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.37% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authorization Bypass
Impact
Broken Access Control
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H
Published
10 September 2026
Updated
15 October 2026
Weakness
CWE-863

Vendor fix

Update to Consul 2.0.4 or Consul Enterprise 1.21.18, 1.22.12, 2.0.4 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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