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

Quick assessment

Affected
open-webui open-webui
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Open WebUI是Open WebUI开源的一个可扩展、功能丰富、用户友好的自托管 WebUI。 Open WebUI 0.8.6之前版本存在安全漏洞，该漏洞源于从知识库删除文件时缺少访问控制检查，可能导致任意文件被删除。

CVSS 5.4 · Medium EPSS 0.38% · P29
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I. Basic Information for CVE-2026-29070

Vulnerability Information
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Vulnerability Title
Open WebUI has unauthorized deletion of knowledge files
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Open WebUI 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open WebUI是Open WebUI开源的一个可扩展、功能丰富、用户友好的自托管 WebUI。 Open WebUI 0.8.6之前版本存在安全漏洞，该漏洞源于从知识库删除文件时缺少访问控制检查，可能导致任意文件被删除。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
open-webui open-webui < 0.8.6 -

II. Public POCs for CVE-2026-29070

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III. Intelligence Information for CVE-2026-29070

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Same Patch Batch · open-webui · 2026-03-26 · 4 CVEs total

CVE-2026-28788 7.1 HIGH Open WebUI's process_files_batch() endpoint missing ownership check, allows unauthorized f
CVE-2026-28786 4.3 MEDIUM Open WebUI vulnerable to Path Traversal in `POST /api/v1/audio/transcriptions`
CVE-2026-29071 3.1 LOW Open WebUI's Insecure Direct Object Reference (IDOR) allows access to other users' memorie

IV. Related Vulnerabilities

Same product: open-webui
Same vendor: open-webui
Same weakness: CWE-862

V. Comments for CVE-2026-29070

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