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    CVE-2024-40626

    Outline is an open source, collaborative document editor. A type confusion issue was found in ProseMirror’s rendering process that leads to a Stored Cross-Site Scripting (XSS) vulnerability in Outline. An authenticated user can create a document containing a malicious JavaScript payload. When other users view this document, the malicious Javascript can execute in the origin of Outline. Outline includes CSP rules to prevent third-party code execution, however in the case of self-hosting and having your file storage on the same domain as Outline a malicious payload can be uploaded as a file attachment and bypass those CSP restrictions. This issue has been addressed in release version 0.77.3. Users are advised to upgrade. There are no known workarounds for this vulnerability.

    Published:Jul 16, 2024
    Last Modified:Oct 10, 2025
    EPS:Jul 16, 2024
    EPSS Score:0.00022
    CVSS Score:7.3

    Affected Products

    Vendor
    Getoutline
    Product
    Outline

    Exploits

    https://github.com/outline/outline/security/advisories/GHSA-888c-mvg8-v6whhttps://github.com/outline/outline/security/advisories/GHSA-888c-mvg8-v6wh

    Related CVEs

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    CVE-2026-43886 (CVSS 8.2) — Outline is a service that allows for collaborative documentation. From 0.84.0 to 1.6.1, a logic error in OAuth…
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    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