CVE-2026-115351
MEDIUM
NVD
CVSS Score
4.7
Severity
MEDIUM
Published
Oct 22, 2026
Vendor
unknown
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.