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Advisories

League CommonMark 1.3.0 before 2.10.2 Stored XSS via DisallowedRawHtml Bypass

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severity
medium
date
Affecting

  • commonmark

CWE
  • CWE-80 Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
CVSS
5.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
Credit
4n86rakam1
Description
League CommonMark from 1.3.0 before 2.10.2 contains a cross-site scripting vulnerability that allows users posting Markdown to bypass the DisallowedRawHtml extension by ending raw HTML with a bare disallowed tag name. Attackers can place a lone <script or <iframe line followed by a block supplying attributes like src or onload, executing stored scripts in viewers' browsers under default GFM settings.

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