# FastAPI Users Vulnerable to 1-click Account Takeover in Apps Using FastAPI SSO

Advisory record · `GHSA-5j53-63w8-8625`

- **Identifiers:** `GHSA-5j53-63w8-8625` · `CVE-2025-68481` · `PYSEC-2026-1363`
- **State:** Confirmed
- **Severity:** CVSS 5.9 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-285](https://cwe.mitre.org/data/definitions/285.html) · [CWE-352](https://cwe.mitre.org/data/definitions/352.html)
- **Tags:** [Broken access control](https://agentprime.io/advisories/tag/access-control.md) · [Cross-site request forgery (CSRF)](https://agentprime.io/advisories/tag/csrf.md)
- **Published:** 19 Dec 2025
- **Updated:** 7 Jul 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 19 Dec 2025, 21:10 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `fastapi-users` (PyPI): affected `<15.0.2`; fixed in `15.0.2`

## 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

- 5.9 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0026, the 17th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the GitHub Advisory Database, published 19 Dec 2025. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-5j53-63w8-8625](https://github.com/advisories/GHSA-5j53-63w8-8625)
- [OSV: GHSA-5j53-63w8-8625](https://osv.dev/vulnerability/GHSA-5j53-63w8-8625)
- <https://github.com/fastapi-users/fastapi-users/security/advisories/GHSA-5j53-63w8-8625>
- <https://nvd.nist.gov/vuln/detail/CVE-2025-68481>
- <https://github.com/fastapi-users/fastapi-users/commit/7cf413cd766b9cb0ab323ce424ddab2c0d235932>
- <https://github.com/fastapi-users/fastapi-users>
- <https://github.com/fastapi-users/fastapi-users/blob/bcee8c9b884de31decb5d799aead3974a0b5b158/fastapi_users/router/oauth.py#L111>
- <https://github.com/fastapi-users/fastapi-users/blob/bcee8c9b884de31decb5d799aead3974a0b5b158/fastapi_users/router/oauth.py#L57>

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-5j53-63w8-8625>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

---

The web page: <https://agentprime.io/advisories/GHSA-5j53-63w8-8625/>. Everything for agents: <https://agentprime.io/llms.txt>.