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CVE-2026-103662— MISP Reflected XSS in Taxonomy Tag Confirmation Forms

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 存在一个反射型跨站脚本（XSS）漏洞，位于旧版分类法标签管理确认表单中（添加标签和禁用标签）。 受影响的表单会将用户提供的标签名称值未经转义直接回显到渲染的 HTML 输出中。能够诱导站点管理员访问包含恶意标签名称参数的特制 URL 的攻击者，可以在该管理员的浏览器会话中执行任意 JavaScript 代码。 前提条件： 目标系统必须运行启用了旧版分类法标签确认视图的 MISP 实例。 受害者必须是已认证的站点管理员。 受害者必须访问由攻击者构造的 URL（例如通过钓鱼链接）。 安全影响： 在管理员浏览器

CVSS 5.1 · Medium

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript
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I. Basic Information for CVE-2026-103662

Vulnerability Information
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Vulnerability Title
MISP Reflected XSS in Taxonomy Tag Confirmation Forms
Source: CVE Program / CVE List V5
Vulnerability Description
MISP contains a reflected cross-site scripting (XSS) vulnerability in the legacy taxonomy tag management confirmation forms (add tag and disable tag). The affected forms echoed a user-supplied tag name value from the request unescaped into the rendered HTML output. An attacker who can induce a site administrator to visit a crafted URL containing a malicious tag name parameter can execute arbitrary JavaScript in the administrator's browser session. Preconditions: - The target must be running a MISP instance with the legacy taxonomy tag confirmation views enabled. - The victim must be an authenticated site administrator. - The victim must navigate to the attacker-crafted URL (e.g., via a phishing link). Security impact: - Execution of arbitrary client-side script in the context of the administrator's browser. - Potential theft of session tokens, CSRF tokens, or other sensitive data accessible from the page. - Potential for performing privileged actions on behalf of the administrator within the MISP interface. Affected versions: <2.5.48.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/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-2026-103662

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III. Intelligence Information for CVE-2026-103662

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Patches & Fixes for CVE-2026-103662 (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-2026-103664 4.8 MEDIUM MISP Reflected Cross-Site Scripting via Unsanitized Analyst Data Seed Parameter

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-103662

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