CVE-2026-73374— Stored Cross-Site Scripting (XSS) via Unescaped CNA Reference Tags in vulnerability-lookup

Stored Cross-Site Scripting (XSS) via Unescaped CNA Reference Tags in vulnerability-lookup

A stored cross-site scripting (XSS) vulnerability existed in Vulnerability-Lookup in the render_tag_badges Jinja filter used to display reference tags associated with vulnerability records. Values from containers.cna.references[].tags[] were directly interpolated into HTML badge elements and the resulting string was wrapped in markupsafe.Markup. Because Markup marks the generated content as safe, Jinja's automatic HTML escaping was bypassed. An authenticated user with permissions to create or modify vulnerability records, such as a user holding the vulnerability:create or vulnerability:modify permission, could submit a crafted reference tag through the CNA API containing arbitrary HTML or JavaScript-capable markup. The malicious value would subsequently be stored as part of the vulnerability record. When another user visited the corresponding public /cve/<id> or /vuln/<id> page, the crafted tag would be rendered as HTML in the viewer's browser. This could result in JavaScript execution in the security context of the Vulnerability-Lookup application. Successful exploitation could allow an attacker to perform actions in the context of a victim, access information available to the victim's browser session, or modify page content. As the affected vulnerability pages can be accessed publicly, exploitation may affect users who are not authenticated. The issue was corrected by applying markupsafe.escape() to each reference tag before inserting it into the HTML badge markup, while retaining Markup only for the static HTML scaffolding.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:H/SI:N/SA:N

在Web页面生成时对输入的转义处理不恰当(跨站脚本)

Vulnerability-Lookup 跨站脚本漏洞

Vulnerability-Lookup是Vulnerability-Lookup团队开源的一个漏洞查询与扫描工具。 Vulnerability-Lookup 5.5.1及之前版本存在跨站脚本漏洞，该漏洞源于render_tag_badges Jinja过滤器将引用标签直接插入HTML badge元素并标记为安全，绕过Jinja自动HTML转义，可能导致存储型跨站脚本攻击，造成JavaScript执行，攻击者可代表受害者执行操作、访问浏览器会话信息或修改页面内容。

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