CVE-2025-51691 – MarkTwo XSS Attack Vector

The following table lists the changes that have been made to the
CVE-2025-51691 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by [email protected]

    Aug. 13, 2025

    Action Type Old Value New Value
    Added Description Cross-Site Scripting (XSS) vulnerability found in MarkTwo commit e3a1d3f90cce4ea9c26efcbbf3a1cbfb9dcdb298 (May 2025) allows a remote attacker to execute arbitrary code via a crafted script input to the editor interface. The application does not properly sanitize user-supplied Markdown before rendering it. Successful exploitation could lead to session hijacking, credential theft, or arbitrary client-side code execution in the context of the victim’s browser.
    Added Reference https://github.com/0x72303074/CVE-Disclosures/tree/main/MarkTwo%20Markdown%20Editor/CVE-2025-51691
    Added Reference https://github.com/anthonygarvan/marktwo
    Added Reference https://marktwo.app/try-it-now
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