---
id: "CVE-2024-25128"
kind: "vulnerability"
aliases: ["CVE-2024-25128", "GHSA-j2pw-vp55-fqqj"]
title: "Flask-AppBuilder vulnerable to incorrect authentication when using auth type OpenID"
severity: "critical"
cvss: 9.1
epss: 0.00857
exploited: false
status: "open"
category: "package"
products: [{"name": "Flask-AppBuilder", "fixed": ["4.3.11"], "affected": "< 4.3.11", "ecosystem": "pypi"}, {"name": "dpgaspar flask-appbuilder", "fixed": ["4.3.11"], "affected": "< 4.3.11", "ecosystem": "vendor"}]
ecosystems: ["pypi", "vendor"]
tags: ["cwe-287", "flask", "flask-appbuilder", "package", "python", "self-hosted"]
not_affected_if: ["auth-type-not-oid", "patched-4.3.11"]
published_at: "2024-02-28T18:37:06+00:00"
first_seen_at: "2026-10-27T16:35:55+00:00"
updated_at: "2026-10-27T17:03:04+00:00"
sources: [{"source": "ghsa", "url": "https://github.com/advisories/GHSA-j2pw-vp55-fqqj", "first_seen_at": "2026-10-27T16:35:55+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-25128", "first_seen_at": "2026-10-27T17:03:04+00:00"}]
---

# Flask-AppBuilder vulnerable to incorrect authentication when using auth type OpenID

Flask-AppBuilder's OpenID 2.0 login (AUTH_OID) lets a forged request make the backend authenticate against any OpenID service the attacker names, including one the attacker runs. That can grant unauthorised access to the application.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- pypi:Flask-AppBuilder affected < 4.3.11 fixed 4.3.11
- vendor:dpgaspar flask-appbuilder affected < 4.3.11 fixed 4.3.11

## How to check

- Check the installed version with `pip show Flask-AppBuilder`; versions below `4.3.11` are affected.
- Check the config for `AUTH_TYPE = AUTH_OID`; the flaw only applies when OpenID 2.0 is the login method.

## Fix

- Upgrade Flask-AppBuilder to `4.3.11`.
- If the upgrade is not possible, apply the workaround from the advisory: a custom `AuthOIDView` whose login rejects any OpenID provider URL not in `openid_providers`, wired in via `FAB_SECURITY_MANAGER_CLASS`.
- Or move off AUTH_OID to another authentication type.

## Timeline

- 2026-10-27T16:35:55+00:00 ghsa https://github.com/advisories/GHSA-j2pw-vp55-fqqj
- 2026-10-27T17:03:04+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2024-25128

## From the sources

### Impact
When Flask-AppBuilder is set to AUTH_TYPE AUTH_OID, allows an attacker to forge an HTTP request, that could deceive the backend into using any requested OpenID service. This vulnerability could grant an attacker unauthorised privilege access if a custom OpenID service is deployed by the attacker and accessible by the backend. 

This vulnerability is only exploitable when the application is using the old (deprecated 10 years ago) OpenID 2.0 authorization protocol (which is very different from the popular OIDC - Open ID Connect - popular protocol used today). Currently, this protocol is regarded as legacy, with significantly reduced usage and not supported for several years by major authorization providers.

### Patches
Upgrade to Flask-AppBuilder 4.3.11

### Workarounds
If upgrade is not possible add the following to your config:

```
from flask import flash, redirect
from flask_appbuilder import expose
from flask_appbuilder.security.sqla.manager import SecurityManager
from flask_appbuilder.security.views import AuthOIDView
from flask_appbuilder.security.forms import LoginForm_oid

basedir = os.path.abspath(os.path.dirname(__file__))


class FixedOIDView(AuthOIDView):
    @expose("/login/", methods=["GET", "POST"])
    def login(self, flag=True):
        form = LoginForm_oid()
        if form.validate_on_submit():
            identity_url = None
            for provider in self.appbuilder.sm.openid_providers:
                if provider.get("url") == form.openid.data:
                    identity_url = form.openid.data
            if identity_url is None:
                flash(self.invalid_login_message, "warning")
                return redirect(self.appbuilder.get_url_for_login)
        return super().login(flag=flag)

class FixedSecurityManager(SecurityManager):
    authoidview = FixedOIDView


FAB_SECURITY_MANAGER_CLASS = "config.FixedSecurityManager"
```

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