Vulnerability · Published Sep 17, 2026 · Assigned by EEF
CVE-2026-81632Single-use sign-in token placed in a redirect query string in AshAuthenticationPhoenix
High 7.2
In plain English
A high-severity security flaw in ash_authentication from team-alembic. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities).
Official description
Use of HTTP Request With Sensitive Query String vulnerability in team-alembic AshAuthenticationPhoenix allows someone able to read access logs, proxy logs or browser history to recover a single-use sign-in token and authenticate as its owner. After a successful password sign-in, AshAuthentication.Phoenix.Components.Password.SignInForm builds the sign_in_with_token path with the freshly issued user.__metadata__.token as a query parameter and redirects the browser to it with a GET. The token therefore travels in the request line, where web servers, reverse proxies, request telemetry and the browser's own history record it, all of which outlive the request and are ordinarily less protected than session storage. The redirect destination is restricted to a local path, so this is not an open redirect; the exposure is the retention of a live credential. This issue affects ash_authentication_phoenix: from 1.7.0 before 2.17.4 and from 3.0.0-rc.0 before 3.0.0-rc.11; ash_authentication: from 3.10.5 before 4.15.0 and from 5.0.0-rc.0 before 5.0.0-rc.14.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| team-alembic | ash_authentication_phoenix | 1.7.0 – before 2.17.43.0.0-rc.0 – before 3.0.0-rc.11 |
| team-alembic | ash_authentication_phoenix | 903f3a386e1aba2f7b070187ef6f31215a92bdfd – before * |
| team-alembic | ash_authentication | 3.10.5 – before 4.15.05.0.0-rc.0 – before 5.0.0-rc.14 |
| team-alembic | ash_authentication | eca8cadea0f1595ed2c10a0c177b1da9aa9e5269 – before * |
Weakness: CWE-598 · Vector: 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
References
- https://github.com/team-alembic/ash_authentication_phoenix/security/advisories/GHSA-8jh5-339h-mqx9 vendor-advisory, related
- EEF CNA record for CVE-2026-81632 related
- OSV record EEF-CVE-2026-81632 related
- https://github.com/team-alembic/ash_authentication/security/advisories/GHSA-j726-59hm-r46r vendor-advisory, related
- Introducing commit 903f3a3 in team-alembic/ash_authentication_phoenix related
- Fix commit 920257d in team-alembic/ash_authentication_phoenix patch
- Fix commit ff5ad87 in team-alembic/ash_authentication_phoenix patch
- Introducing commit eca8cad in team-alembic/ash_authentication related
- Fix commit bbf345c in team-alembic/ash_authentication patch
- Fix commit 8d8ddd2 in team-alembic/ash_authentication patch