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CVE-2026-96581— An upsert on the primary key in Ash ignores attribute multitenancy, so one tenant can read, overwrite and take over another tenant's records

Quick assessment

Affected
ash-project ash
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.

ash 项目中的 ash 组件存在“通过用户可控密钥绕过授权”的漏洞。该漏洞允许一个租户的用户通过带 upsert 功能的创建操作，读取、覆盖并接管另一个租户的数据记录。 在属性级多租户模式下， （位于 ）和 （位于 ）在执行 upsert 操作时，若基于主键或 身份标识进行，未将冲突记录限制在当前请求的租户范围内。当调用者发起一个设置了 为 且接受主键的创建操作，并传入属于其他租户的记录 ID 时，系统会更新该记录的 upsert 字段，并在返回结果中包含其全部属性。在默认 upsert 字段配置下，租户属性也会

CVSS 7.6 · High
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I. Basic Information for CVE-2026-96581

Vulnerability Information
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Vulnerability Title
An upsert on the primary key in Ash ignores attribute multitenancy, so one tenant can read, overwrite and take over another tenant's records
Source: CVE Program / CVE List V5
Vulnerability Description
Authorization Bypass Through User-Controlled Key vulnerability in ash-project ash allows a user of one tenant to read, overwrite and take over another tenant's records via an upserting create action. Under attribute multitenancy, Ash.Actions.Create (lib/ash/actions/create/create.ex) and Ash.Actions.Create.Bulk (lib/ash/actions/create/bulk.ex) upserted on the primary key, or on an all_tenants? identity, without scoping the conflicting record to the request's tenant. A caller of a create action with upsert? true that accepts the primary key, supplying a record id from another tenant, updated that record's upsert fields and received all of its attributes in the result. With the default upsert fields the tenant attribute was written too, moving the record into the caller's tenant. Read and update policies do not run for upserts, and tenant-scoped create policies pass because the tenant is the caller's own. This issue affects ash: from 1.22.0 before 3.37.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
ash-project ash 1.22.0 ~ 3.37.2 cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*
ash-project ash 2333d01ddf37e5909769a513059b27e3183331c5 ~ c9f0cdb31e7c084def05f3f5be69dd7bb7721754 cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-96581

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III. Intelligence Information for CVE-2026-96581

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Patches & Fixes for CVE-2026-96581 (1)

Vendor Advisories for CVE-2026-96581 (3)

IV. Related Vulnerabilities

Same product: ash
Same vendor: ash-project
Same weakness: CWE-639