CVE-2026-48822

Sažetak

Shaarli is a personal bookmarking service. Versions 0.16.1 and prior contain a stored Cross-Site Scripting (XSS) vulnerability in the Markdown-to-HTML conversion process used in the Bookmark Description field. An authenticated user can inject a malicious javascript: URI inside a Markdown link. The vulnerability originates in the filterProtocols method within BookmarkMarkdownFormatter.php.This method attempts to sanitize Markdown links by filtering dangerous protocols (such as javascript:) before rendering. It uses the following regular expression: (#]\((.*?)\)#is). This regex is designed to detect inline Markdown links, but it fails to detect Markdown reference-style links because reference-style links are resolved by the Markdown parser after preprocessing. The filterProtocols method never inspects the actual URL used in these references and as a result, an attacker can supply a javascript: URI inside a reference definition. This issue has been fixed in version 0.16.2.

Reference

CVSS

Base:	5.8
Impact:	5.2
Exploitability:	0.6

Pristup

Vektor	Složenost	Autentikacija
LOCAL	LOW	HIGH

Impact

Povjerljivost	Cjelovitost	Dostupnost
HIGH	HIGH	NONE

CVSS vektor

CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N

Zadnje važnije ažuriranje

18-06-2026 - 17:16

Objavljeno

17-06-2026 - 20:17