# CVE-2026-29070: Open WebUI has unauthorized deletion of knowledge files

> Attackers with write access to any knowledge base can delete arbitrary files from other knowledge bases due to missing ownership checks.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/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:** 26 Mar 2026
- **Updated:** 30 Mar 2026
- **Also known as:** GHSA-26gm-93rw-cchf, PYSEC-2026-2693

## What is CVE-2026-29070?

CVE-2026-29070 is a medium-severity missing authorization vulnerability in Openwebui Open Webui, published on 26 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to version 0.8.6, an access control check is missing when deleting a file from a knowledge base. The only check being done is that the user has write access to the knowledge base (or is admin), but NOT that the file actually belongs to this knowledge base. It is thus possible to delete arbitrary files from arbitrary knowledge bases (as long as one knows the file id). Version 0.8.6 patches the issue.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-29070?

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


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `open-webui` | PyPI | All versions | 0.8.6 |
| `open-webui` | PyPI | All versions | 0.8.6 |
| `open-webui` | PyPI | All versions | 0.8.6 |

Products: Openwebui Open Webui.

## How do I fix CVE-2026-29070?

Upgrade open-webui to 0.8.6 or later.

## Is CVE-2026-29070 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-29070 exists.

## 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-2026-29070 and fix it if it is affected.

What it is: CVE-2026-29070 is a medium-severity missing authorization vulnerability in Openwebui Open Webui, published on 26 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-29070 exists.

Affected packages and fixed versions:
- open-webui (PyPI): affected all versions; fixed in 0.8.6
- open-webui (PyPI): affected all versions; fixed in 0.8.6
- open-webui (PyPI): affected all versions; fixed in 0.8.6

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-2026-29070/ (Markdown: https://insights.sbomify.com/CVE-2026-29070/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-29070
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-29070
- OSV: https://osv.dev/vulnerability/CVE-2026-29070

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-29070/
Summaries are generated and may contain mistakes; the official description above is the record.