P4Verified

CVE-2026-5389: justhtml 0 to before 1.13.0

CVE-2026-5389. CVSS 3.1 base score 6.1 (MEDIUM, Vendor/CNA). EPSS 0.00263 (percentile 0.16695), scored 11-Oct-2026.

Affected technology

justhtml · 0 to before 1.13.0
EmilStenstrom

Description’s affected range: versions before 1.13.0

Component: Not specified by the source
Function: when

Attack conditions (Vendor/CNA, CVSS 4.0): Network (remote) · No privileges required · Active user interaction

What an attacker can do

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. Vendor/CNA’s CVSS 4.0 assessment (base score 5.1/10) rates confidentiality, integrity and availability impact as none.

Published 12-Oct-2026 16:55 UTC

CWE: CWE-80
CCR priority: 24.5 /100 (P4)
CVSS 3.1: 6.1 /10 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N · Vendor/CNA
EPSS: 0.00263 · percentile 0.16695 · 2026-10-11
KEV: no

Provenance

NVD CVE API 2.0 · Source record · observed 2026-10-12 16:54:24.294989+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2026-5389.html