CVE-2026-87995

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    CVE-2026-87995

    Published: 9 Sept 2026Last Modified: 12 Sept 2026

    Summary: Open WebUI: Same-origin XSS to account takeover via terminal port-preview iframe hardcoding allow-same-origin

    Details: Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.11 until 0.11.1, src/lib/components/chat/FileNav/PortPreview.svelte rendered terminal port content in an iframe sandbox containing both allow-scripts and allow-same-origin. Because the terminal proxy serves that content from the Open WebUI origin, an authenticated user with access to a shared terminal server could host script on a previewed port and take over a victim's account when the victim opened the preview. This issue is fixed in version 0.11.1.

    References: https://github.com/open-webui/open-webui/releases/tag/v0.11.1, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/87xxx/CVE-2026-87995.json, https://github.com/open-webui/open-webui/security/advisories/GHSA-jmc6-2wr8-h3wj, https://nvd.nist.gov/vuln/detail/CVE-2026-87995, https://github.com/open-webui/open-webui/commit/54d7a223707f03172efbb9e754db6e69709956d0

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 4d058a125b17eb57212af5eab98d683548d546e3
    Fixed -54d7a223707f03172efbb9e754db6e69709956d0

    Affected versions

    v0.11.0

    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
    CVE-2026-87995 | CVE-DB