Is CVE-2026-73628 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-73628?

CVE-2026-73628 has a CVSS v3 severity of MEDIUM (6.1).

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CVE-2026-73628

Description

Serendipity versions >= 2.3.5 and <= 2.6.0 contain a reflected cross-site scripting vulnerability in the search clean-URL route (/search/<term>). In include/functions_routing.inc.php serveSearch(), the sanitisation pipeline runs urldecode() after HTML-encoding, so a single URL-encoded HTML payload survives strip_tags() and htmlspecialchars() and is then decoded back into live HTML in the page. A crafted search link can execute arbitrary JavaScript in the victim's browser. Fixed in 2.6.1.