{"id":"CVE-2026-50190","aliases":["GHSA-xm98-h5jj-64xv"],"url":"https://o3.security/vulnerability/CVE-2026-50190","summary":"Shaarli vulnerable to stored XSS via raw bookmark title in document <title> element on public permalink page","details":"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.","published":"2026-08-20T18:49:48.952Z","modified":"2026-08-22T03:31:12.382849406Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50190.json"},{"type":"ADVISORY","url":"https://github.com/shaarli/Shaarli/security/advisories/GHSA-xm98-h5jj-64xv"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50190"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-22T03:31:12.382849406Z"}}