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CVE-2025-66458— Lookyloo has multiple XSS due to unsafe use of f-strings in Markup

Quick assessment

Affected
Lookyloo lookyloo
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.

Lookyloo是Lookyloo开源的一个网站捕获工具。 Lookyloo 1.35.3之前版本存在跨站脚本漏洞，该漏洞源于Markup中f字符串使用不安全，可能导致跨站脚本攻击。

AI Predicted 6.1 Difficulty: Easy EPSS 0.19% · P8
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I. Basic Information for CVE-2025-66458

Vulnerability Information
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Vulnerability Title
Lookyloo has multiple XSS due to unsafe use of f-strings in Markup
Source: CVE Program / CVE List V5
Vulnerability Description
Lookyloo is a web interface that allows users to capture a website page and then display a tree of domains that call each other. Prior to 1.35.3, there are multiple XSS due to unsafe use of f-strings in Markup. The issue requires a malicious 3rd party server responding with a JSON document containing JS code in a script element. This vulnerability is fixed in 1.35.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA: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
Lookyloo 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Lookyloo是Lookyloo开源的一个网站捕获工具。 Lookyloo 1.35.3之前版本存在跨站脚本漏洞，该漏洞源于Markup中f字符串使用不安全，可能导致跨站脚本攻击。
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
Lookyloo lookyloo < 1.35.3 -

II. Public POCs for CVE-2025-66458

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III. Intelligence Information for CVE-2025-66458

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Vendor Advisories for CVE-2025-66458 (1)

Same Patch Batch · Lookyloo · 2025-12-02 · 3 CVEs total

CVE-2025-66460 Lookyloo vulnerable to XSS due to lack of escaping in HTML elements passed to Datatables
CVE-2025-66459 Lookyloo vulnerable to XSS due to unescaped error message passed to innerHTML

IV. Related Vulnerabilities

Same product: lookyloo
Same vendor: Lookyloo
Same weakness: CWE-79

V. Comments for CVE-2025-66458

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