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CVE-2026-115635— AshPostgres returns another tenant's record for a skipped upsert when return_skipped_upsert? is set

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.

ash-project 中的 ash_postgres 存在授权不当漏洞，允许用户通过被跳过的 upsert 操作读取其他租户的记录。 当 或单个 操作以 upsert 模式运行，且配置了 ，若 upsert 因条件不满足（例如 未成立）而被跳过时， 会在 和 中根据 upsert 身份标识回读现有行。该查找过程未应用资源属性的多租户策略（multitenancy），因此对于采用 策略的资源，可能错误匹配并返回具有相同身份标识值的另一租户的行，从而将其字段暴露给调用者。 此问题影响 ash_postgres 从 2

CVSS 6.0 · Medium

Affected Version Matrix 2

VendorProduct Version RangeStatus
ash-project ash_postgres 2.6.22< 2.15.2 affected
af0903f1380468bbe1b61fe65acb33772b5e24a5< 8aa81220c401cae412d21078d11b3519ea25d3a9 affected
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I. Basic Information for CVE-2026-115635

Vulnerability Information
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Vulnerability Title
AshPostgres returns another tenant's record for a skipped upsert when return_skipped_upsert? is set
Source: CVE Program / CVE List V5
Vulnerability Description
Incorrect Authorization vulnerability in ash-project ash_postgres allows a user to read another tenant's record through a skipped upsert. When Ash.bulk_create/4 or a single create runs as an upsert with return_skipped_upsert?: true and the upsert is skipped (for example because its upsert_condition does not hold), AshPostgres.DataLayer reads the existing row back by the upsert identity in do_bulk_create/3 and upsert/4. That lookup did not apply the resource's attribute multitenancy, so on a resource using strategy :attribute it could match and return the row of another tenant with the same identity values, exposing its fields to the caller. This issue affects ash_postgres: from 2.6.22 before 2.15.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
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
ash-project ash_postgres 2.6.22 ~ 2.15.2 cpe:2.3:a:ash-project:ash_postgres:*:*:*:*:*:*:*:*
ash-project ash_postgres af0903f1380468bbe1b61fe65acb33772b5e24a5 ~ 8aa81220c401cae412d21078d11b3519ea25d3a9 cpe:2.3:a:ash-project:ash_postgres:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-115635

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III. Intelligence Information for CVE-2026-115635

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Other References for CVE-2026-115635 (5)

Same Patch Batch · ash-project · 2026-10-25 · 3 CVEs total

CVE-2026-114214 6.0 MEDIUM Loading a through relationship with a limit of 1 in Ash ignores the through path and retur
CVE-2026-115627 6.0 MEDIUM AshPostgres ignores attribute multitenancy on the join resource when loading many_to_many

IV. Related Vulnerabilities

Same product: ash_postgres
Same vendor: ash-project
Same weakness: CWE-863