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CVE-2026-87090— Consul vulnerable to an authorization bypass in the catalog node-write path

Quick assessment

Affected
HashiCorp Consul
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Consul 和 Consul Enterprise 在目录（catalog）的节点写入路径中存在一个授权绕过漏洞，可能允许经过身份验证的攻击者删除其他节点的目录注册信息，并接管该节点的身份。如果攻击者拥有一个授予单个节点名称“节点写入”权限的令牌，并且能够获取到一个其无法控制的节点的节点 ID，就可以利用此漏洞。该漏洞（CVE-2026-87090）已在 Consul 2.0.4 以及 Consul Enterprise 1.21.18、1.22.12 和 2.0.4 中修复。

CVSS 8.3 · High

Affected Version Matrix 2

VendorProduct Version RangeStatus
HashiCorp Consul 0.1.0< 2.0.4 affected
HashiCorp Consul Enterprise 0.1.0< 2.0.4 affected
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I. Basic Information for CVE-2026-87090

Vulnerability Information
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Vulnerability Title
Consul vulnerable to an authorization bypass in the catalog node-write path
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
HashiCorp Consul 0.1.0 ~ 2.0.4 -
HashiCorp Consul Enterprise 0.1.0 ~ 2.0.4 -

II. Public POCs for CVE-2026-87090

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III. Intelligence Information for CVE-2026-87090

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Vendor Advisories for CVE-2026-87090 (1)

Same Patch Batch · HashiCorp · 2026-09-10 · 5 CVEs total

CVE-2026-87993 7.7 HIGH Consul-template vulnerable to an information disclosure issue in error handling
CVE-2026-88021 7.5 HIGH Consul vulnerable to an authorization bypass in the Connect service mesh
CVE-2026-87106 6.5 MEDIUM Consul vulnerable to a denial of service in the native RPC listener
CVE-2026-87107 5.4 MEDIUM Consul vulnerable to an authorization bypass in the catalog deregistration path

IV. Related Vulnerabilities

Same product: Consul
Same vendor: HashiCorp
Same weakness: CWE-863

V. Comments for CVE-2026-87090

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