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CVE-2026-103389— MISP Stored Cross-Site Scripting via Unvalidated Galaxy Icon Field in Correlation Graph

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 galaxy（星系）图标处理路径中存在一个存储型跨站脚本（XSS）漏洞。Galaxy 对象的 icon 字段在通过 galaxy 添加、编辑以及同步/导入捕获接口进行持久化时，未执行任何服务器端验证。随后，该存储值被基于 D3 的相关性图渲染脚本（包括默认主题和 Overmind 主题）直接使用 方法拼接到 HTML 标记中。 拥有 权限的用户（该权限默认授予标准的 User 角色）可以在 icon 字段中存储任意的 HTML 或 JavaScript 代码。任何打开包含属于该 galaxy 的 cl

CVSS 6.2 · Medium EPSS 0.30% · P21

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript

Affected Version Matrix 1

VendorProduct Version RangeStatus
MISP MISP < 2.5.48 affected
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I. Basic Information for CVE-2026-103389

Vulnerability Information
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Vulnerability Title
MISP Stored Cross-Site Scripting via Unvalidated Galaxy Icon Field in Correlation Graph
Source: CVE Program / CVE List V5
Vulnerability Description
MISP contains a stored cross-site scripting (XSS) vulnerability in the galaxy icon handling path. The icon field of a galaxy object was persisted without any server-side validation through the galaxy add, edit, and sync/import capture endpoints. The stored value was subsequently concatenated directly into HTML markup by the D3-based correlation graph rendering scripts (both the default and Overmind themes) using the .html() method. A user holding the perm_galaxy_editor permission, which is granted to the stock User role, could store arbitrary HTML or JavaScript in the icon field. Any other user who opened the correlation graph of an event containing a cluster belonging to that galaxy would have the injected script executed in their browser session. Impact: - Arbitrary script execution in the context of the victim's MISP session - Potential theft of session credentials, manipulation of displayed data, or initiation of actions on behalf of the victim - Affects both the default and Overmind UI themes Affected versions: <2.5.48
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:H/SI:H/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-2026-103389

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III. Intelligence Information for CVE-2026-103389

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Patches & Fixes for CVE-2026-103389 (1)

Same Patch Batch · MISP · 2026-09-30 · 6 CVEs total

CVE-2026-103235 8.7 HIGH MISP Event Delegation Mass Assignment Allows Retargeting Delegation to Arbitrary Events
CVE-2026-103239 8.6 HIGH MISP Tag Collection Save Allows Privilege Escalation via Sibling Model Injection
CVE-2026-103237 8.3 HIGH MISP: Nested Model Alias Key Bypasses Sanitization to Modify Cross-Tenant Rows
CVE-2026-103321 8.3 HIGH MISP Stored Cross-Site Scripting (XSS) via Unvalidated Event Graph Preview Image
CVE-2026-103388 6.2 MEDIUM MISP Stored Cross-Site Scripting via JavaScript URL in Galaxy Cluster Source Field

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-103389

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