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    CVE-2026-70480

    Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.6.34 until 0.11.0, Open WebUI renders vega and vega-lite fenced code blocks in chat content by building a Vega view in the viewer browser without a restricted resource loader. Any user who can place such a block where another user will see it can make that user browser issue attacker-chosen outbound GET requests and read responses from same-origin or CORS-permissive targets into the rendered page. This issue is fixed in 0.11.0.

    Published:Aug 4, 2026
    Last Modified:Sep 18, 2026
    EPS:Aug 4, 2026
    EPSS Score:0.00192
    CVSS Score:4.1

    Affected Products

    Vendor
    Open-webui
    Product
    Open-webui
    Vendor
    Openwebui
    Product
    Open Webui

    Exploits

    https://github.com/open-webui/open-webui/security/advisories/GHSA-rffm-9q57-q649https://github.com/open-webui/open-webui/security/advisories/GHSA-rffm-9q57-q649

    Common Weakness Enumeration

    CWE-918 Server-Side Request Forgery

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-664 Server Side Request Forgery

    Related CVEs

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    CVE-2026-109290 (CVSS 8.4) — Open WebUI from 0.11.1 before 0.11.4 contains a stored cross-site scripting vulnerability in DocxPreview.svelt…
    CVE-2026-109289 (CVSS 5.3) — Open WebUI from 0.8.8 before 0.11.4 contains an improper authorization vulnerability that allows deactivated u…
    CVE-2026-109287 (CVSS 5.3) — Open WebUI from 0.9.6 before 0.11.4 contains an authorization flaw where the knowledge base file listing does …
    CVE-2026-109285 (CVSS 2.3) — Open WebUI from 0.6.0 before 0.11.4 contains an improper access control vulnerability in has_access_to_file th…
    CVE-2026-109284 (CVSS 5.3) — Open WebUI from 0.11.0 before 0.11.4 contains an improper authorization vulnerability in the chat fork handler…
    CVE-2026-109283 (CVSS 5.3) — Open WebUI from 0.11.1 before 0.11.4 contains an authorization bypass in the OAuth token exchange endpoint, wh…
    CVE-2026-88006 (CVSS 6.5) — Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.0 until 0.11.1,…
    CVE-2026-88005 (CVSS 6.5) — Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.0 until 0.9.0, …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High