PT-2026-121531

CVE-2026-115351

Published

2026-10-22

Updated

2026-10-22

Description by

CVSS 4.0

5.3

Medium

MetricsAV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Name of the Vulnerable Software and Affected Versions Mistune versions 3.2.1 through 3.2.x

Description An issue exists where attackers controlling markdown input can inject arbitrary style declarations. This occurs through the unvalidated figwidth option of the figure directive. By appending declarations such as background:url(), attackers can force victim browsers to send requests to external servers, potentially leaking attribute values.

Recommendations Update Mistune to version 3.3.0.

Exploitability

Exploit

Fix

Impacts

Researchers

Offset

Vendors

Affected products

Weakness enumeration

CWE-94: Improper Control of Generation of Code (\'Code Injection\')

Related identifiers