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CVE-2026-93856

Quick assessment

Affected
OpenStack Cinder
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.

在 OpenStack Cinder 29.0.0 及更早版本中，消息 API 存在跨项目信息泄露漏洞。当具有项目范围（project-scoped）"member"或"reader"角色的非管理员用户调用块存储 API v3.3 的“列出消息（List messages）”接口时，响应中会包含其他项目的未过期用户消息，导致泄露其他项目所拥有资源的 UUID。此外，响应中还会包含关于其他项目资源的用户消息（尽管按设计这些消息已被处理为经过脱敏的通用消息）。所有 Cinder 部署均受此漏洞影响。

CVSS 4.3 · Medium
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I. Basic Information for CVE-2026-93856

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
In OpenStack Cinder through 29.0.0, cross-project information disclosure can occur in the Messages API. A non-admin user with the project-scoped 'member' or 'reader' role making the Block Storage API v3.3 "List messages" call finds the non-expired user messages for other projects included in the response, resulting in the leakage of UUIDs of resources owned by other projects, in addition to the user message about the other projects' resources (which, by design, are sanitized generic messages). All Cinder deployments are affected.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在范围间的资源转移不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenStack Cinder 9.0.0 ~ 26.3.1 -

II. Public POCs for CVE-2026-93856

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III. Intelligence Information for CVE-2026-93856

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Vendor Advisories for CVE-2026-93856 (2)

Mailing List Discussions for CVE-2026-93856 (1)

IV. Related Vulnerabilities

Same vendor: OpenStack
Same weakness: CWE-669

V. Comments for CVE-2026-93856

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