Source: shaarli Version: 0.16.1+dfsg-1 Severity: important Tags: security upstream X-Debbugs-Cc: [email protected], Debian Security Team <[email protected]>
Hi, The following vulnerability was published for shaarli. CVE-2026-48821[0]: | Shaarli is a personal bookmarking service. Versions 0.16.1 and prior | contain a DOM-based Cross-Site Scripting (XSS) vulnerability in the | Thumbnail Synchronizer feature. When an administrator runs the | thumbnail update process, malicious bookmark titles are returned via | an AJAX response and inserted into the DOM using innerHTML without | proper sanitization. The issue originates from the interaction | between the backend thumbnail update endpoint and the frontend | JavaScript responsible for rendering update progress. On the | backend, the ThumbnailsController::ajaxUpdate method returns | bookmark data formatted using the 'raw' formatter. This includes the | unescaped bookmark title in the JSON response. On the client side, | the script thumbnails-update.js processes this AJAX response and | dynamically updates the progress interface. Administrators using the | thumbnail synchronization feature are affected and exploitation | could lead to session hijacking, privilege escalation, backdoor | injection and full compromise. This issue has been fixed in version | 0.16.2. If you fix the vulnerability please also make sure to include the CVE (Common Vulnerabilities & Exposures) id in your changelog entry. For further information see: [0] https://security-tracker.debian.org/tracker/CVE-2026-48821 https://www.cve.org/CVERecord?id=CVE-2026-48821 [1] https://github.com/shaarli/Shaarli/security/advisories/GHSA-mw63-f9qj-c5h3 Please adjust the affected versions in the BTS as needed. Regards, Salvatore
