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CVE-2026-70482— Open WebUI: Account takeover via OAuth token exchange accepting tokens issued to any client

Quick assessment

Affected
open-webui open-webui
Exploitation
Public or AI PoC available; prioritize validation
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 0.8.0版本至0.11.0之前版本存在授权问题漏洞，该漏洞源于OAuth令牌交换功能未确认访问令牌的OAuth客户端归属，可能导致持有任意客户端有效访问令牌的攻击者获取Open WebUI用户会话。

CVSS 8.1 · High EPSS 0.57% · P45

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
open-webui open-webui >= 0.8.0, < 0.11.0 affected
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I. Basic Information for CVE-2026-70482

Vulnerability Information
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Vulnerability Title
Open WebUI: Account takeover via OAuth token exchange accepting tokens issued to any client
Source: CVE Program / CVE List V5
Vulnerability Description
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.0 until 0.11.0, when ENABLE_OAUTH_TOKEN_EXCHANGE=True, /oauth/{provider}/token/exchange accepts a raw provider access token and validates it by calling the provider userinfo endpoint without confirming which OAuth client the token was issued to. Anyone holding an access token minted for any client registered with the same provider could exchange it for an Open WebUI session as that token user, including applications the operator does not control and has never authorized. This issue is fixed in 0.11.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Open WebUI 授权问题漏洞
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 0.8.0版本至0.11.0之前版本存在授权问题漏洞，该漏洞源于OAuth令牌交换功能未确认访问令牌的OAuth客户端归属，可能导致持有任意客户端有效访问令牌的攻击者获取Open WebUI用户会话。
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 >= 0.8.0, < 0.11.0 -

II. Public POCs for CVE-2026-70482

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 7700 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-70482

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Patches & Fixes for CVE-2026-70482 (1)

Vendor Advisories for CVE-2026-70482 (1)

Vendor Pages for CVE-2026-70482 (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-2026-70494 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-2026-70491 6.5 MEDIUM Open WebUI: Tool source code disclosed to read-only users via the tool list and get endpoi
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-287

V. Comments for CVE-2026-70482

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