CVEvulnerability

CVE-2026-71478

6.1 MEDIUM Published 2026-08-06 Modified 2026-10-24 Official page ↗
Status
Awaiting Analysis
Published
2026-08-06
Last modified
2026-10-24
Assigner
[email protected]
CVSS 3.1 ([email protected])
6.1 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weaknesses
CWE-692, CWE-79, CWE-86

Description

league/commonmark is a PHP library for parsing and rendering CommonMark Markdown. From 1.5.0 until 2.9.0, the AttributesExtension's href and src unsafe-link filter can be bypassed by embedding control bytes, such as a tab, carriage return, line feed, or leading C0 control character, in a javascript: URL that browsers discard before parsing the scheme, causing the browser to still execute the script even when the unsafe-link filter is enabled. This issue is fixed in 2.9.0.

Related

Weakness · CWE (3)

  • CWE-692 Incomplete Denylist to Cross-Site Scripting weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation weakness
  • CWE-86 Improper Neutralization of Invalid Characters in Identifiers in Web Pages weakness

References