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CVE-2026-103664— MISP Reflected Cross-Site Scripting via Unsanitized Analyst Data Seed Parameter

Quick assessment

Affected
MISP MISP
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.

MISP 在分析师数据备注面板中存在一个反射型跨站脚本（XSS）漏洞。该漏洞源于用户通过 URL 提供的 路径参数，未经任何净化或类型强制检查，直接嵌入到渲染后的 HTML 响应中的内联 JavaScript 代码中。 攻击者若能诱使已认证的 MISP 用户访问一个精心构造的 URL（例如通过钓鱼链接），即可注入任意 JavaScript 代码，使其在受害者的浏览器上下文中执行。这可能允许攻击者读取会话令牌、操纵页面内容，或代表受害者执行操作。 前提条件： 受害者必须已登录 MISP，并访问某个属性或对象的分析师数

CVSS 4.8 · Medium

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript
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I. Basic Information for CVE-2026-103664

Vulnerability Information
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Vulnerability Title
MISP Reflected Cross-Site Scripting via Unsanitized Analyst Data Seed Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
MISP contains a reflected cross-site scripting (XSS) vulnerability in the analyst data notes panel. The seed path parameter, supplied by the user via the URL, was passed directly into inline JavaScript within the rendered HTML response without any sanitization or type enforcement. An attacker who can convince an authenticated MISP user to navigate to a crafted URL (for example, via a phishing link) can inject arbitrary JavaScript that executes in the victim's browser context. This may allow the attacker to read session tokens, manipulate the page, or perform actions on behalf of the victim. Preconditions: - The victim must be authenticated to MISP and access the analyst data view for an attribute or object. - The attacker must supply a malicious seed value in the URL path. Impact: - Execution of arbitrary JavaScript in the victim's browser session. - Potential theft of session credentials or sensitive data visible in the page. - Manipulation of the analyst data interface. Affected: MISP versions prior to the fix (commit 58925dbf0, post v2.5.48).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/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

Affected Products

Vendor Product Affected Versions CPE Subscribe
MISP MISP 0 ~ 2.5.48 cpe:2.3:a:misp:misp:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-103664

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III. Intelligence Information for CVE-2026-103664

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Patches & Fixes for CVE-2026-103664 (1)

Same Patch Batch · MISP · 2026-10-01 · 6 CVEs total

CVE-2026-103655 9.3 CRITICAL MISP TOTP Code Replay Allows Duplicate Authentication Within Validity Period
CVE-2026-103651 7.6 HIGH MISP HOTP Token Replay via Stale Session-Cached Counter Allows Second-Factor Authenticatio
CVE-2026-103659 7.1 HIGH MISP: Object Distribution ACL Bypass via Event Flattening Exposes Organisation-Only Attrib
CVE-2026-103858 5.3 MEDIUM MISP Incomplete Thread Authorization Allows Unauthorized Read and Post Access to Discussio
CVE-2026-103662 5.1 MEDIUM MISP Reflected XSS in Taxonomy Tag Confirmation Forms

IV. Related Vulnerabilities

Same product: MISP
Same vendor: MISP
Same weakness: CWE-79

V. Comments for CVE-2026-103664

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