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CVE-2026-85227— Reflected Cross-Site Scripting in MISP Event Filtering via taggedAttributes and galaxyAttachedAttributes Parameters

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是MISP组织开源的一套开源的软件解决方案。该产品用于收集、存储、分发、共享网络安全指标,并具有威胁网络安全事件分析和恶意软件分析等功能。 MISP 2.5.45及之前版本存在跨站脚本漏洞，该漏洞源于taggedAttributes和galaxyAttachedAttributes参数在插入查询构建器规则时未进行HTML转义，可能造成反射型跨站脚本攻击，导致在用户浏览器中执行任意JavaScript。

CVSS 6.1 · Medium EPSS 0.25% · P16

Possible ATT&CK Techniques 2 AI

T1122 T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
misp misp ≤ 2.5.45 affected
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I. Basic Information for CVE-2026-85227

Vulnerability Information
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Vulnerability Title
Reflected Cross-Site Scripting in MISP Event Filtering via taggedAttributes and galaxyAttachedAttributes Parameters
Source: CVE Program / CVE List V5
Vulnerability Description
MISP contains a reflected Cross-Site Scripting (XSS) vulnerability in the event attribute filtering query builder. The taggedAttributes and galaxyAttachedAttributes URL parameters were inserted into the query-builder rules without HTML escaping before being serialized as JSON and embedded inside a <script> element. Because JsonTool::encode() uses JSON_UNESCAPED_SLASHES, an attacker-controlled value containing a closing </script> sequence could terminate the surrounding script element and inject arbitrary HTML or JavaScript. For example, a specially crafted viewEventAttributes URL could contain malicious content in one of the affected filter parameters. An attacker could exploit the vulnerability by convincing an authenticated MISP user to follow a crafted URL. Successful exploitation would execute attacker-controlled JavaScript in the security context of the MISP instance and with the privileges of the victim's authenticated browser session. This could allow access to information available to the victim, modification of data through authenticated requests, or other actions permitted by the victim's MISP permissions. The vulnerability is addressed by applying HTML escaping with h() to both scalar and array values before they are inserted into the DOM.
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:H
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
MISP 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MISP是MISP组织开源的一套开源的软件解决方案。该产品用于收集、存储、分发、共享网络安全指标,并具有威胁网络安全事件分析和恶意软件分析等功能。 MISP 2.5.45及之前版本存在跨站脚本漏洞，该漏洞源于taggedAttributes和galaxyAttachedAttributes参数在插入查询构建器规则时未进行HTML转义，可能造成反射型跨站脚本攻击，导致在用户浏览器中执行任意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
misp misp 0 ~ 2.5.45 -

II. Public POCs for CVE-2026-85227

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III. Intelligence Information for CVE-2026-85227

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Patches & Fixes for CVE-2026-85227 (1)

Same Patch Batch · misp · 2026-09-03 · 9 CVEs total

CVE-2026-85216 9.5 CRITICAL MISP LDAP and LinOTP Authentication Bypass via Empty or Invalid Credentials
CVE-2026-85236 8.8 HIGH MISP cullEmptyEvents CSRF Allows Irreversible Deletion of Events via GET Request
CVE-2026-85237 8.6 HIGH Missing Rate Limiting in Email OTP Verification Allows Brute-Force Authentication Bypass
CVE-2026-85221 7.6 HIGH MISP CurlClient TLS Peer Verification Disabled by Default Enables Man-in-the-Middle Attack
CVE-2026-85238 7.6 HIGH Session Fixation in MISP CustomAuth Authentication Allows Session Hijacking
CVE-2026-85239 7.1 HIGH MISP Event Template Definition Validation Bypass Allows Persistent Denial of Service
CVE-2026-85226 5.3 MEDIUM MISP OnDemand Correlation Engine Missing Access Control Allows Disclosure of Restricted Co
CVE-2026-85230 5.3 MEDIUM MISP Dashboard Button Widget Allows Persistent JavaScript URL Injection

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-85227

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