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CVE-2026-42999

Quick assessment

Affected
OpenStack Keystone
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.

OpenStack Keystone是OpenStack开源的一个核心认证组件库。 OpenStack Keystone 29.0.2之前版本存在安全漏洞，该漏洞源于RBAC策略执行器无条件合并原始JSON请求体，可能导致认证用户注入任意策略目标属性绕过RBAC检查。

CVSS 6.0 · Medium EPSS 0.42% · P36

Affected Version Matrix 3

VendorProduct Version RangeStatus
OpenStack Keystone 14.0.0< 27.0.2 affected
28.0.0< 28.0.2 affected
29.0.0< 29.0.2 affected
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I. Basic Information for CVE-2026-42999

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
An issue was discovered in OpenStack Keystone before 29.0.2. The Keystone RBAC policy enforcer in enforce_call unconditionally merges the raw JSON request body into the policy enforcement dictionary via policy_dict.update(json_input.copy()), overwriting trusted target data that was previously set from database lookups. Because flask.request.get_json is called with force=True, this works regardless of Content-Type or HTTP method. Any authenticated user can inject arbitrary policy target attributes (e.g., user_id, project_id) into the request body to bypass RBAC checks and perform unauthorized operations on resources belonging to other users or projects. This was introduced in commit 5ea59f52 (Rocky/14.0.0).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
OpenStack Keystone 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenStack Keystone是OpenStack开源的一个核心认证组件库。 OpenStack Keystone 29.0.2之前版本存在安全漏洞，该漏洞源于RBAC策略执行器无条件合并原始JSON请求体，可能导致认证用户注入任意策略目标属性绕过RBAC检查。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenStack Keystone 14.0.0 ~ 27.0.2 -

II. Public POCs for CVE-2026-42999

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III. Intelligence Information for CVE-2026-42999

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Vendor Advisories for CVE-2026-42999 (2)

Same Patch Batch · OpenStack · 2026-05-28 · 5 CVEs total

CVE-2026-42998 6.0 MEDIUM OpenStack Keystone 安全漏洞
CVE-2026-43000 6.0 MEDIUM OpenStack Keystone 安全漏洞
CVE-2026-44394 6.0 MEDIUM OpenStack Keystone 安全漏洞
CVE-2026-49299 OpenStack Neutron 安全漏洞

IV. Related Vulnerabilities

Same product: Keystone
Same vendor: OpenStack
Same weakness: CWE-863

V. Comments for CVE-2026-42999

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