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CVE-2026-78699— rename_tenant returns :ok on a failed rename, enabling cross-tenant access in AshPostgres

Quick assessment

Affected
ash-project ash_postgres
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.

以下是该漏洞描述信息的中文翻译： 在 Ash 项目的 库中存在一个未检查返回值（Unchecked Return Value）漏洞。 漏洞描述 中的未检查返回值漏洞使得能够触发租户重命名的攻击者，可以将租户重命名为与现有租户的架构（schema）冲突的名称。这会导致该租户的记录被指向另一个正在运行的租户的架构，从而让攻击者获得访问该其他租户数据的权限。 技术细节 调用 语句时，使用的是不会抛出异常的 。该函数丢弃了查询返回的 或 结果，并无条件返回 。 当目标架构已存在（或由于权限不足或锁超时）时，PostgreS

CVSS 7.2 · High
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I. Basic Information for CVE-2026-78699

Vulnerability Information
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Vulnerability Title
rename_tenant returns :ok on a failed rename, enabling cross-tenant access in AshPostgres
Source: CVE Program / CVE List V5
Vulnerability Description
Unchecked Return Value vulnerability in ash-project ash_postgres allows a user who can drive a tenant rename to a name that collides with an existing tenant's schema to have their tenant record repointed at that other tenant's live schema, gaining access to its data. AshPostgres.MultiTenancy.rename_tenant/3 issues the ALTER SCHEMA ... RENAME TO ... with the non-raising Ecto.Adapters.SQL.query/2, discards its {:ok, _} | {:error, _} result, and unconditionally returns :ok. PostgreSQL rejects the rename when the target schema already exists (and on insufficient privilege or lock timeout), but that failure never reaches the caller. The calling manage_tenant update action therefore sees success and commits the tenant row with the new name, which is the schema of a different existing tenant, so subsequent reads and writes for that tenant run against the other tenant's data. This issue affects ash_postgres: from 0.25.0 before 2.13.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/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
未加检查的返回值
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
ash-project ash_postgres 0.25.0 ~ 2.13.0 cpe:2.3:a:ash-project:ash_postgres:*:*:*:*:*:*:*:*
ash-project ash_postgres 03510dae24020e302558ef947be7ea874a9ce756 ~ 8544ab15fe45784553c2d2da8ee1a388eee0174b cpe:2.3:a:ash-project:ash_postgres:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-78699

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III. Intelligence Information for CVE-2026-78699

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Patches & Fixes for CVE-2026-78699 (1)

Vendor Advisories for CVE-2026-78699 (3)

Same Patch Batch · ash-project · 2026-08-30 · 14 CVEs total

CVE-2026-75847 5.9 MEDIUM Sensitive attribute values stored in a non-sensitive public changes map in AshPaperTrail
CVE-2026-77970 5.9 MEDIUM Sensitive fields nested in embedded values are not redacted in AshPaperTrail versions
CVE-2026-78038 5.9 MEDIUM Job argument injection via :args overrides primary_key and tenant in AshOban
CVE-2026-78228 5.9 MEDIUM Unbounded handle_error recursion enables denial of service in AshOban triggers
CVE-2026-77454 5.9 MEDIUM exists/2 predicate silently dropped on limited relationships with a parent() filter in Ash
CVE-2026-81319 5.9 MEDIUM Unsafe deserialization of decrypted terms enables node DoS in AshCloak
CVE-2026-77831 2.1 LOW Algorithmic-complexity denial of service in AshPaperTrail full-diff list tracking
CVE-2026-77846 2.1 LOW JSON path injection via unescaped get_path segments in AshSqlite
CVE-2026-81318 2.1 LOW Distinct-query aggregate drops the tenant schema prefix, leaking across tenants in AshSql
CVE-2026-78691 2.1 LOW Unescaped backslash allows LIKE wildcard injection in AshSql string search
CVE-2026-80227 2.1 LOW SQL string_trim removes only spaces, diverging from in-memory trimming in AshSql
CVE-2026-81316 2.1 LOW Same-named aggregates with differing filters are conflated in AshSql
CVE-2026-81322 2.1 LOW Cloaked plaintext leaks through a non-sensitive action argument in AshCloak

IV. Related Vulnerabilities

Same product: ash_postgres
Same vendor: ash-project
Same weakness: CWE-252

V. Comments for CVE-2026-78699

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