# CVE-2026-70481: Open WebUI: Any member with write access to a standard channel can edit or delete other members' messages

> Any channel member can edit or delete other users' messages due to missing authorship checks in standard channel handlers.

- **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:** 4 Aug 2026
- **Updated:** 5 Aug 2026
- **Also known as:** GHSA-mj5r-jf49-m3w7, PYSEC-2026-3649

## What is CVE-2026-70481?

CVE-2026-70481 is a medium-severity missing authorization vulnerability in Openwebui Open Webui, published on 4 Aug 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 0.5.0 until 0.11.0, the standard channel message update and delete handlers accepted any caller holding write access on the channel without checking that the caller wrote the message. Because write access is the same grant a member needs to post, any ordinary participant in a shared standard channel could rewrite or permanently delete another participant message, while group and direct message handlers enforced authorship. This issue is fixed in 0.11.0.

Weakness: CWE-862 (Missing Authorization), CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2026-70481?

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


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `open-webui` | PyPI | From 0.5.0 | 0.11.0 |
| `open-webui` | PyPI | From 0.5.0 | 0.11.0 |
| `open-webui` | PyPI | From 0.5.0 | 0.11.0 |

Products: Openwebui Open Webui.

## How do I fix CVE-2026-70481?

Upgrade open-webui to 0.11.0 or later.

## Is CVE-2026-70481 being exploited?

There is no known exploitation of CVE-2026-70481 in the wild and no public exploit code.

Public exploit code:

- https://github.com/Foxer131/CVE-2026-70481 (github_poc): https://github.com/Foxer131/CVE-2026-70481

## 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-2026-70481 and fix it if it is affected.

What it is: CVE-2026-70481 is a medium-severity missing authorization vulnerability in Openwebui Open Webui, published on 4 Aug 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-2026-70481 in the wild and no public exploit code.

Affected packages and fixed versions:
- open-webui (PyPI): affected from 0.5.0; fixed in 0.11.0
- open-webui (PyPI): affected from 0.5.0; fixed in 0.11.0
- open-webui (PyPI): affected from 0.5.0; fixed in 0.11.0

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-2026-70481/ (Markdown: https://insights.sbomify.com/CVE-2026-70481/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-70481
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-70481
- OSV: https://osv.dev/vulnerability/CVE-2026-70481

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-70481/
Summaries are generated and may contain mistakes; the official description above is the record.