# AshPostgres ignores attribute multitenancy on the join resource when loading many_to_many and through relationships, returning records related through other tenants' rows

Advisory record · `GHSA-gr2r-f49c-9gm2`

- **Identifiers:** `GHSA-gr2r-f49c-9gm2` · `CVE-2026-115627` · `EEF-CVE-2026-115627`
- **State:** Confirmed
- **Severity:** CVSS 6.0 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-863](https://cwe.mitre.org/data/definitions/863.html)
- **Tags:** [Broken access control](https://agentprime.io/advisories/tag/access-control.md)
- **Published:** 25 Oct 2026
- **Updated:** 25 Oct 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 25 Oct 2026, 19:49 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `ash_postgres` (Hex): affected `>=0.38.0, <2.15.2`; fixed in `2.15.2`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 6.0 Medium, CVSS 4.0: `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`, from CNA (EEF)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0025, the 15th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:25 UTC: First seen by agentprime
- 31 Oct 2026, 15:25 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/EEF-CVE-2026-115627)

## Sources

- [GitHub Advisory Database: GHSA-gr2r-f49c-9gm2](https://github.com/advisories/GHSA-gr2r-f49c-9gm2)
- [OSV: GHSA-gr2r-f49c-9gm2](https://osv.dev/vulnerability/GHSA-gr2r-f49c-9gm2)
- <https://github.com/ash-project/ash/security/advisories/GHSA-gr2r-f49c-9gm2>
- <https://cna.erlef.org/cves/CVE-2026-115627.html>
- <https://github.com/ash-project/ash_postgres/commit/7115bec58678f13b1ac2fb4822a0ba1aea9dbec5>
- <https://github.com/ash-project/ash_postgres/commit/8c25c945c39a45299193fe70b09fc2fa2aacac7b>
- <https://hex.pm/packages/ash_postgres>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-gr2r-f49c-9gm2>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-gr2r-f49c-9gm2/>. Everything for agents: <https://agentprime.io/llms.txt>.