View at Official ubuntu advisory, NVD, CVE.org · CVE detail
Freshness: upstream tracker timestamp is available; use API updated time as primary recency signal.
CVE-2011-4090 medium priority: Ubuntu including 1 source packages (serendipity), 17 status rows across 17 suites (hardy, lucid, maverick, natty, oneiric, precise, quantal, raring, saucy, trusty, upstream, utopic, vivid, wily, xenial, yakkety, zesty): DNE 8, ignored 8, released 1.
Serendipity before 1.6 has an XSS issue in the karma plugin which may allow privilege escalation.