Security Bulletin
Summary
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 Details
CVEID: CVE-2026-87090
DESCRIPTION: The catalog node-registration endpoint did not fully validate that a requesting token had permission over all nodes that a write operation could affect. A caller with limited node-write access could submit a crafted registration request that, when applied, affected a node outside the scope of their permitted access, potentially resulting in the loss of that node's catalog registration and associated services and health checks. Exploiting this issue requires a valid ACL token with node:write permission on at least one node, as well as knowledge of an identifier associated with a target node. Consul deployments that do not use ACLs, or in which all operators hold unrestricted node-write permission, are not affected by this issue.
CWE: CWE-863: Incorrect Authorization
CVSS Source: HashiCorp Inc.
CVSS Base score: 8.3
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H)
Affected Products and Versions
| Affected Product(s) | Version(s) |
| Consul Community Edition | affected from 0.1.0 up to 2.0.4 |
| Consul Enterprise | affected from 0.1.0 up to 2.0.4, unaffected from 1.21.18, 1.22.12 |
Remediation/Fixes
Customers should evaluate the risk associated with this issue and consider upgrading to Consul 2.0.4 or Consul Enterprise 1.21.18, 1.22.12, or 2.0.4.
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References
Acknowledgement
This issue was reported to HashiCorp by Raphael Zanarelli.
Change History
10 Sep 2026: Initial Publication
*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.
Disclaimer
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Document Location
Worldwide
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Document Information
Modified date:
10 September 2026
Initial Publish date:
10 September 2026
UID
ibm17287027