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Advisories

Mistune 3.2.1 before 3.3.0 CSS Injection via Figure Directive figwidth Option

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Severity
medium
Date
Affecting

  • mistune >= 3.2.1, < 3.3.0

CWE
  • CWE-94 Improper Control of Generation of Code ('Code Injection')
CVSS
5.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Credit
offset
Description
Mistune from 3.2.1 before 3.3.0 contains a CSS injection vulnerability that allows attackers controlling markdown input to inject arbitrary style declarations via the unvalidated figwidth option of the figure directive. Attackers can append declarations like background:url() to the rendered figure style attribute, forcing victim browsers to send requests to attacker servers and leak attribute values.

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