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CVE-2026-73628— Serendipity 2.3.5 Reflected XSS via search clean-URL route

Quick assessment

Affected
s9y Serendipity
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

s9y serendipity是s9y个人开发者开源的一款博客发布平台软件。 s9y serendipity 2.3.5版本至2.6.0版本存在跨站脚本漏洞，该漏洞源于serveSearch()函数在清理搜索路径时在HTML编码后执行urldecode()，导致URL编码的HTML载荷绕过strip_tags()和htmlspecialchars()并被解码为活动HTML，可能导致特制搜索链接在受害者浏览器中执行任意JavaScript。

CVSS 6.1 · Medium EPSS 0.26% · P18

Affected Version Matrix 1

VendorProduct Version RangeStatus
s9y Serendipity 2.3.5≤ 2.6.0 affected
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I. Basic Information for CVE-2026-73628

Vulnerability Information
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Vulnerability Title
Serendipity 2.3.5 Reflected XSS via search clean-URL route
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
s9y serendipity 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
s9y serendipity是s9y个人开发者开源的一款博客发布平台软件。 s9y serendipity 2.3.5版本至2.6.0版本存在跨站脚本漏洞，该漏洞源于serveSearch()函数在清理搜索路径时在HTML编码后执行urldecode()，导致URL编码的HTML载荷绕过strip_tags()和htmlspecialchars()并被解码为活动HTML，可能导致特制搜索链接在受害者浏览器中执行任意JavaScript。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
s9y Serendipity 2.3.5 ~ 2.6.0 -

II. Public POCs for CVE-2026-73628

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III. Intelligence Information for CVE-2026-73628

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Vendor Advisories for CVE-2026-73628 (2)

IV. Related Vulnerabilities

Same product: Serendipity
Same vendor: s9y
Same weakness: CWE-79