Shaarli up to 0.16.2 BookmarkListController.php getTitle cross site scripting

Summaryinfo

A vulnerability was found in Shaarli up to 0.16.2. It has been declared as problematic. The impacted element is the function getTitle of the file application/front/controller/visitor/BookmarkListController.php. The manipulation results in cross site scripting. This vulnerability is known as CVE-2026-50190. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability classified as problematic has been found in Shaarli up to 0.16.2. Affected is the function getTitle of the file application/front/controller/visitor/BookmarkListController.php. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-50190 since 06/04/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation requires an enhanced level of successful authentication. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.007.

By approaching the search of inurl:application/front/controller/visitor/BookmarkListController.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 0.16.3 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-63551). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

• Shaarli

Version

• 0.16.0
• 0.16.1
• 0.16.2

Website

• Product: https://github.com/shaarli/Shaarli/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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