# CVE-2026-88005: Open WebUI: Users denied by the OAuth domain allowlist or role policy can still sign in via token exchange

> Attackers with valid provider tokens can bypass OAuth domain allowlists to gain unauthorized access to Open WebUI accounts.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 10 Sep 2026
- **Updated:** 15 Sep 2026
- **Also known as:** GHSA-4qg5-cxx4-g927, PYSEC-2026-4119

## What is CVE-2026-88005?

CVE-2026-88005 is a medium-severity authentication bypass vulnerability in Openwebui Open Webui, published on 10 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.0 until 0.9.0, Open WebUI's OAuth token exchange endpoint issues a session for a provider access token without applying the email domain allowlist that the normal OAuth login callback enforces. An account whose email domain the login callback would refuse could still obtain a working session through this endpoint. This issue is fixed in version 0.9.0.

Weakness: CWE-863 (Incorrect Authorization)

## Which versions are affected by CVE-2026-88005?

3 open source packages ship an affected version, including open-webui. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `open-webui` | PyPI | From 0.8.0 | 0.9.0 |
| `open-webui` | PyPI | From 0.8.0 | 0.9.0 |
| `open-webui` | PyPI | From 0.8.0 | 0.9.0 |

Products: Openwebui Open Webui.

## How do I fix CVE-2026-88005?

Upgrade open-webui to 0.9.0 or later.

## Is CVE-2026-88005 being exploited?

There is no known exploitation of CVE-2026-88005 in the wild and no public exploit code.

## Other vulnerabilities in Openwebui Open Webui

- [CVE-2026-44551](https://insights.sbomify.com/CVE-2026-44551/): Open WebUI: LDAP Empty Password Authentication Bypass (critical 9.1)
- [CVE-2026-56400](https://insights.sbomify.com/CVE-2026-56400/): open-webui - Remote Code Execution via CORS Misconfiguration and Session Validation (critical 9.0)
- [CVE-2024-8017](https://insights.sbomify.com/CVE-2024-8017/): Cross-site Scripting (XSS) in open-webui/open-webui (critical 9.0)
- [CVE-2026-45672](https://insights.sbomify.com/CVE-2026-45672/): Open WebUI: Jupyter code execution works despite `ENABLE_CODE_EXECUTION=false` — feature gate bypassed (high 8.8)
- [CVE-2026-87995](https://insights.sbomify.com/CVE-2026-87995/): Open WebUI: Same-origin XSS to account takeover via terminal port-preview iframe hardcoding allow-same-origin (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-88005 and fix it if it is affected.

What it is: CVE-2026-88005 is a medium-severity authentication bypass vulnerability in Openwebui Open Webui, published on 10 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-88005 in the wild and no public exploit code.

Affected packages and fixed versions:
- open-webui (PyPI): affected from 0.8.0; fixed in 0.9.0
- open-webui (PyPI): affected from 0.8.0; fixed in 0.9.0
- open-webui (PyPI): affected from 0.8.0; fixed in 0.9.0

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-88005/ (Markdown: https://insights.sbomify.com/CVE-2026-88005/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-88005
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-88005
- OSV: https://osv.dev/vulnerability/CVE-2026-88005

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-88005/
Summaries are generated and may contain mistakes; the official description above is the record.