CVE-2026-73628

Serendipity 2.3.5 Reflected XSS via search clean-URL route

Published Aug 13, 2026 CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Serendipity 2.3.5 Reflected XSS via search clean-URL route
First Time appeared S9y
S9y serendipity
Weaknesses CWE-79
CPEs cpe:2.3:a:s9y:serendipity:2.3.5:*:*:*:*:*:*:*
cpe:2.3:a:s9y:serendipity:2.4.0:-:*:*:*:*:*:*
cpe:2.3:a:s9y:serendipity:2.4.0:beta1:*:*:*:*:*:*
cpe:2.3:a:s9y:serendipity:2.5.0:-:*:*:*:*:*:*
cpe:2.3:a:s9y:serendipity:2.6.0:-:*:*:*:*:*:*
cpe:2.3:a:s9y:serendipity:2.6.0:beta1:*:*:*:*:*:*
Vendors & Products S9y
S9y serendipity
References
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}

cvssV4_0

{'score': 5.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Sep 30, 2026, 5:20 PM
Reserved
Aug 13, 2026, 11:17 AM
Status
Deferred
Published
Aug 13, 2026, 12:17 PM
Modified
Oct 24, 2026, 3:10 PM