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    CVE-2025-15265

    An SSR XSS exists in async hydration when attacker‑controlled keys are passed to hydratable. The key is embedded inside a <script> block without HTML‑safe escaping, allowing </script> to terminate the script and inject arbitrary JavaScript. This enables remote script execution in users' browsers, with potential for session theft and account compromise. This issue affects Svelte: from 5.46.0 before 5.46.3.

    Published:Jan 15, 2026
    Last Modified:Jan 23, 2026
    EPS:Jan 15, 2026
    EPSS Score:0.00101
    CVSS Score:6.1

    Affected Products

    Vendor
    Svelte
    Product
    Svelte

    Exploits

    https://fluidattacks.com/advisories/lydianhttps://fluidattacks.com/advisories/lydianhttps://fluidattacks.com/advisories/lydianhttps://fluidattacks.com/advisories/lydian

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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