CVE-2026-48822

What it is

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.

At a glance

Exploitability

Can be exploited locally on the machine with an admin-level account, but needs a user to act. High risk of data exposure, data tampering.

Exploit odds

0.1% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-06-17 20:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-18 17:16 UTC Last updatedMost recent change to the record

Details

Published

2026-06-17 20:17 UTC

Last modified

2026-06-18 17:16 UTC

Exploit probability

0.1% · EPSS, next 30 days

Weakness

CWE-79 · Cross-site scripting

Record status

Deferred

Attack profile CVSS 3.1 · 5.8

Attack vector

Local

Complexity

Low

Privileges needed

High

User interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None