Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-70491— Open WebUI: Tool source code disclosed to read-only users via the tool list and get endpoints

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团队开源的一个可扩展、功能丰富、用户友好的自托管 WebUI。 Open WebUI 0.10.2及之前版本存在信息泄露漏洞，该漏洞源于backend/open_webui/routers/tools.py中的GET /api/v1/tools/、GET /api/v1/tools/list和GET /api/v1/tools/id/{id}端点错误地返回完整Python工具源代码，可能允许非管理员只读用户获取其他用户的服务器端工具源代码，导致包含硬编码API密钥

CVSS 6.5 · Medium EPSS 0.48% · P39

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
open-webui open-webui < 0.11.0 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-70491

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Open WebUI: Tool source code disclosed to read-only users via the tool list and get endpoints
Source: CVE Program / CVE List V5
Vulnerability Description
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. In 0.10.2 and earlier, the GET /api/v1/tools/, GET /api/v1/tools/list, and GET /api/v1/tools/id/{id} endpoints in backend/open_webui/routers/tools.py returned full Python tool source to authenticated non-admin read-only users. ToolResponse deliberately omitted source and specs, but ToolUserResponse permitted extra fields and handlers spread a full tool model dump into the response, re-admitting omitted fields. A non-admin with a read grant can obtain another user's server-side tool source, which commonly embeds hard-coded API keys, credentials, and internal service URLs. This issue is fixed in 0.11.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Open WebUI 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open WebUI是Open WebUI团队开源的一个可扩展、功能丰富、用户友好的自托管 WebUI。 Open WebUI 0.10.2及之前版本存在信息泄露漏洞，该漏洞源于backend/open_webui/routers/tools.py中的GET /api/v1/tools/、GET /api/v1/tools/list和GET /api/v1/tools/id/{id}端点错误地返回完整Python工具源代码，可能允许非管理员只读用户获取其他用户的服务器端工具源代码，导致包含硬编码API密钥
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 < 0.11.0 -

II. Public POCs for CVE-2026-70491

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-70491

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-70491 (2)

Vendor Advisories for CVE-2026-70491 (1)

Vendor Pages for CVE-2026-70491 (1)

Same Patch Batch · open-webui · 2026-08-04 · 17 CVEs total

CVE-2026-70492 8.7 HIGH Open WebUI: Stored XSS via unescaped KaTeX render-error fallback in rendered messages
CVE-2026-70486 8.2 HIGH Open WebUI: Same-origin XSS to account takeover via terminal file-preview iframe hardcodin
CVE-2026-70482 8.1 HIGH Open WebUI: Account takeover via OAuth token exchange accepting tokens issued to any clien
CVE-2026-70494 8.1 HIGH Open WebUI: A folder write-collaborator can permanently delete the owner's chats by deleti
CVE-2026-70479 7.7 HIGH Open WebUI: SSRF into internal services via unvalidated sub-resource requests in the Playw
CVE-2026-70485 7.1 HIGH Open WebUI: Any authenticated user can reach internal services and cloud metadata via NAT6
CVE-2026-70493 6.5 MEDIUM Open WebUI: Any authenticated user can stall a worker via a knowledge-search pattern that
CVE-2026-70489 6.5 MEDIUM Open WebUI: Instance-wide stall via automation recurrence rules that force multi-second pa
CVE-2026-54020 6.3 MEDIUM Open WebUI: DNS Rebinding SSRF Bypass
CVE-2026-70490 6.3 MEDIUM Open WebUI: Unapproved accounts can open terminal sessions via a WebSocket auth path missi
CVE-2026-70481 5.4 MEDIUM Open WebUI: Any member with write access to a standard channel can edit or delete other me
CVE-2026-70487 5.3 MEDIUM Open WebUI: Cross-user file content disclosure via request-scoped direct model knowledge m
CVE-2026-70484 4.3 MEDIUM Open WebUI: Users denied the image-generation permission can still generate images via cha
CVE-2026-70488 4.3 MEDIUM Open WebUI: Deletion of directories and file embeddings in other knowledge bases via sync
CVE-2026-70480 4.1 MEDIUM Open WebUI: Client-side SSRF via unrestricted external resource loading in Vega/Vega-Lite
CVE-2026-70483 3.1 LOW Open WebUI: Any authenticated user can cancel another user's chat generation via the chat

IV. Related Vulnerabilities

Same product: open-webui
Same vendor: open-webui
Same weakness: CWE-200

V. Comments for CVE-2026-70491

No comments yet

Leave a comment