{"id":"CVE-2026-73628","title":"Serendipity versions >= 2.3.5 and <= 2.6.0 contain a reflected cross-site scripting vulnerability in the search clean-URL route (/search/<term>)","summary":"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 urldecod…","severity":"medium","cvss":6.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","cwe":["CWE-79"],"vendor":"s9y","product":"Serendipity","affected":["Serendipity >= 2.3.5 <= 2.6.0"],"published":"2026-08-13","updated":"2026-09-30","sourceUpdated":"2026-09-30T18:18:40.107","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73628","references":[{"url":"https://github.com/s9y/Serendipity/security/advisories/GHSA-6c2x-mjmq-vx4q","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/serendipity-reflected-xss-via-search-clean-url-route","label":"disclosure@vulncheck.com"},{"url":"https://github.com/s9y/Serendipity/security/advisories/GHSA-6c2x-mjmq-vx4q","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"epss":0.00263,"epssPercentile":0.18002,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-08-13T15:08:16.669318Z"},"ingestedAt":"2026-09-09T21:22:45.533Z","slug":"CVE-2026-73628","body":"## Overview\n\nSerendipity 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":46,"depthScoreParts":{"impact":33.6,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":213845,"id":"CVE-2026-73628","ts":1790792437131,"field":"exploit_available","old":"false","new":"true"}]}