High severity · published Sep 10, 2026
CVE-2026-87090
Consul vulnerable to an authorization bypass in the catalog node-write path
8.3
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 31% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CO
Consul · HashiCorp
0.1.0 before 2.0.4 · source: vendor
CE
Consul Enterprise · HashiCorp
0.1.0 before 2.0.4 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-87090
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-87090
discuss.hashicorp.com
https://discuss.hashicorp.com/t/hcsec-2026-34-consul-vulnerable-to-an-authorization-bypass-in-the-catalog-node-write-path/77736
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