# CVE-2026-87998: Open WebUI: Non-admin users can delete admin-owned external knowledge connections via knowledge base deletion

> Non-admin users can delete admin-owned external knowledge connections, disrupting shared configurations and availability for other users.

- **Severity:** High 7.1 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 9 Sep 2026
- **Updated:** 10 Sep 2026
- **Also known as:** GHSA-2724-6cpj-gf3v, PYSEC-2026-4115

## What is CVE-2026-87998?

CVE-2026-87998 is a high-severity missing authorization vulnerability in Openwebui Open Webui, published on 9 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.10.0 until 0.11.1, DELETE /api/v1/knowledge/{id}/delete in backend/open_webui/routers/knowledge.py authorized deletion against the knowledge base but then removed its administrator-owned external connection without a separate administrator check or a check for other dependent knowledge bases. A non-administrator with write access to one external knowledge base could delete shared instance configuration and make every other knowledge base using that connection unavailable. This issue is fixed in version 0.11.1.

Weakness: CWE-863 (Incorrect Authorization), CWE-269 (Improper Privilege Management)

## Which versions are affected by CVE-2026-87998?

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


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `open-webui` | PyPI | From 0.10.0 | 0.11.1 |
| `open-webui` | PyPI | From 0.10.0 | 0.11.1 |
| `open-webui` | PyPI | From 0.10.0 | 0.11.1 |

Products: Openwebui Open Webui.

## How do I fix CVE-2026-87998?

Upgrade open-webui to 0.11.1 or later.

## Is CVE-2026-87998 being exploited?

There is no known exploitation of CVE-2026-87998 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-2026-87998 and fix it if it is affected.

What it is: CVE-2026-87998 is a high-severity missing authorization vulnerability in Openwebui Open Webui, published on 9 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-87998 in the wild and no public exploit code.

Affected packages and fixed versions:
- open-webui (PyPI): affected from 0.10.0; fixed in 0.11.1
- open-webui (PyPI): affected from 0.10.0; fixed in 0.11.1
- open-webui (PyPI): affected from 0.10.0; fixed in 0.11.1

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-2026-87998/ (Markdown: https://insights.sbomify.com/CVE-2026-87998/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-87998
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-87998
- OSV: https://osv.dev/vulnerability/CVE-2026-87998

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-87998/
Summaries are generated and may contain mistakes; the official description above is the record.