CVE-2026-73628
Serendipity 2.3.5 Reflected XSS via search clean-URL route
- State
- Published
- Severity
- 5.3 Medium
- Published
- Aug 13, 2026
- Updated
- Sep 30, 2026
- Reserved
- Aug 13, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.3 Medium | 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 | VulnCheck |
| 3.1 | 6.1 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N | VulnCheck |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
Serendipitys9y |
|
References
- GitHub Security Advisory (GHSA-6c2x-mjmq-vx4q)vendor-advisory
- VulnCheck Advisory: Serendipity 2.3.5 Reflected XSS via search clean-URL routethird-party-advisory
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