CVE-2026-50190
HighCVSS 8.6Exploitation Probability (EPSS)
Low risk18th percentile - higher than 18% of all known CVEs
Summary
Shaarli before version 0.16.3 is vulnerable to stored XSS in BookmarkListController.php. The permalink handler concatenates the raw bookmark title into the page title and emits it into the <title> element without HTML escaping. A bookmark title containing </title><script>...</script> can execute a script in the Shaarli origin for any visitor. An attacker can convince an administrator to bookmark a malicious URL, leading to administrator account takeover.
Risk Assessment
Script execution in the Shaarli origin can lead to session theft, administrator account takeover, and data confidentiality breaches.
Recommendation
Upgrade Shaarli to version 0.16.3, which fixes the vulnerability.
Other vulnerabilities in Shaarli
See all- CVE-2026-48823Medium
Shaarli, a personal bookmarking service, contains a stored XSS vulnerability in the tag filtering functionality in versions 0.16.1 and prior. An authenticated user can inject arbitrary JavaScript into the tags field when creating a bookmark, leading to the storage of a malicious payload in the database.
- CVE-2026-48822Medium
Shaarli is a personal bookmarking service that versions 0.16.1 and prior contain a 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.
Original NVD description (English source)
Shaarli is a personal bookmarking service. Versions prior to 0.16.3 are vulnerable to stored XSS in `application/front/controller/visitor/BookmarkListController.php`. The `permalink` handler concatenates the raw `$bookmark->getTitle()` into the `pagetitle` template variable and the RainTPL template emits it into the document `<title>` element without HTML escaping. A bookmark title containing `</title><script>...</script>` closes the document title early and the injected script executes in the Shaarli origin for any visitor of `/shaare/{hash}`. Shaarli's metadata fetcher copies a remote page's `<title>` text verbatim into the local bookmark title, so an attacker who hosts an attacker-controlled URL and convinces an administrator to bookmark it plants the payload with no further interaction — and the resulting permalink fires for every visitor including the administrator on first save, providing a one-shot administrator account takeover. Version 0.16.3 fixes the issue.