# Single-use sign-in token placed in a redirect query string in AshAuthenticationPhoenix

Advisory record · `GHSA-8jh5-339h-mqx9`

- **Identifiers:** `GHSA-8jh5-339h-mqx9` · `CVE-2026-81632` · `EEF-CVE-2026-81632`
- **State:** Confirmed
- **Severity:** CVSS 7.2 High
- **Critical:** No
- **Weakness (CWE):** [CWE-598](https://cwe.mitre.org/data/definitions/598.html)
- **Tags:** [CWE-598](https://agentprime.io/advisories/tag/cwe-598.md)
- **Published:** 17 Sept 2026
- **Updated:** 17 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 17 Sept 2026, 13:09 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `ash_authentication_phoenix` (Hex): affected `>=1.7.0, <2.17.4 || >=3.0.0-rc.0, <3.0.0-rc.11`; fixed in `2.17.4`, `3.0.0-rc.11`
- `ash_authentication` (Hex): affected `>=3.10.5, <4.15.0 || >=5.0.0-rc.0, <5.0.0-rc.14`; fixed in `4.15.0`, `5.0.0-rc.14`

## 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

- 7.2 High, CVSS 4.0: `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`, from CNA (EEF)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0021, the 11th 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-2026-81632)

## Sources

- [GitHub Advisory Database: GHSA-8jh5-339h-mqx9](https://github.com/advisories/GHSA-8jh5-339h-mqx9)
- [OSV: GHSA-8jh5-339h-mqx9](https://osv.dev/vulnerability/GHSA-8jh5-339h-mqx9)
- <https://github.com/team-alembic/ash_authentication_phoenix/security/advisories/GHSA-8jh5-339h-mqx9>
- <https://cna.erlef.org/cves/CVE-2026-81632.html>
- <https://github.com/team-alembic/ash_authentication/security/advisories/GHSA-j726-59hm-r46r>
- <https://github.com/team-alembic/ash_authentication_phoenix/commit/903f3a386e1aba2f7b070187ef6f31215a92bdfd>
- <https://github.com/team-alembic/ash_authentication_phoenix/commit/920257d0460b9c7cbb42a83d0888c10f4eeeb88a>
- <https://github.com/team-alembic/ash_authentication_phoenix/commit/ff5ad8737748afed9cdfde3ec3a05b8a4702a742>
- <https://github.com/team-alembic/ash_authentication/commit/eca8cadea0f1595ed2c10a0c177b1da9aa9e5269>
- <https://github.com/team-alembic/ash_authentication/commit/bbf345c1bb7aa28bce5dd856ac0ed2427f103859>
- <https://github.com/team-alembic/ash_authentication/commit/8d8ddd25c69b669a92a701af74bff42e1aada998>
- <https://hex.pm/packages/ash_authentication_phoenix>
- <https://hex.pm/packages/ash_authentication>

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-8jh5-339h-mqx9>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

---

The web page: <https://agentprime.io/advisories/GHSA-8jh5-339h-mqx9/>. Everything for agents: <https://agentprime.io/llms.txt>.