{"id":"UBUNTU-CVE-2026-48822","details":"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.","modified":"2026-06-24T11:01:45.854576600Z","published":"2026-06-17T20:17:00Z","upstream":["CVE-2026-48822"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-48822"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-48822"},{"type":"REPORT","url":"https://github.com/shaarli/Shaarli/security/advisories/GHSA-2hgr-63wv-x462"}],"affected":[{"package":{"name":"shaarli","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/shaarli?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.0.42~beta~dfsg1-2","0.0.42~beta~dfsg1-2ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"shaarli","binary_version":"0.0.42~beta~dfsg1-2ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48822.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}