Vulnerabilities CVE-2026-5389

CVE-2026-5389

Medium

Open

TLP:CLEAR

justhtml before 1.13.0 XSS via code fence breakout

NVD CVE.org

AI Analysis

No AI analysis yet.

Description

justhtml versions before 1.13.0 contain a cross-site scripting vulnerability in the to_markdown() function when serializing attacker-controlled pre content. Attackers can place backticks inside sanitized pre elements to break out of fixed-length code fences, allowing raw HTML to execute when the generated Markdown is rendered by CommonMark or GFM-style renderers.

Details

CVSS Score: 5.1
CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Confidence: 90%
Published: Aug 23, 2026
Last Modified: Aug 23, 2026

Notes

No notes yet. Click "Add Note" to create the first analysis note.

Opinions

No opinions yet. Be the first to assess this intelligence.