Vulnerability · Published Aug 20, 2026 · Assigned by GitHub_M
CVE-2026-50190Shaarli vulnerable to stored XSS via raw bookmark title in document <title> element on public permalink page
High 8.6
In plain English
A high-severity cross-site scripting in Shaarli from shaarli. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities).
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | shaarli | no fix listed | DEBIAN-CVE-2026-50190 |
| Debian:13 | shaarli | no fix listed | DEBIAN-CVE-2026-50190 |
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
References
- https://github.com/shaarli/Shaarli/security/advisories/GHSA-xm98-h5jj-64xv x_refsource_CONFIRM