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CVE-2026-103321— MISP Stored Cross-Site Scripting (XSS) via Unvalidated Event Graph Preview Image

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 的事件图预览功能中存在一个存储型跨站脚本（XSS）漏洞。 事件图的预览图像字段在未经服务器端验证的情况下被接受并存储。在客户端，该存储值通过字符串拼接的方式渲染到 HTML 元素的 属性中，攻击者可构造恶意值以突破属性上下文限制，从而注入任意脚本。 前提条件： 一个已认证的 MISP 用户，具备创建或修改事件图条目的权限。 另一个用户（受害者），其查看事件图并触发预览弹出框。 影响： 在受害者的浏览器中，于 MISP 应用上下文内执行任意 JavaScript 代码。 可能导致窃取受害者的会话令牌、Coo

CVSS 8.3 · High EPSS 0.36% · P27

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-2026-103321

Vulnerability Information
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Vulnerability Title
MISP Stored Cross-Site Scripting (XSS) via Unvalidated Event Graph Preview Image
Source: CVE Program / CVE List V5
Vulnerability Description
MISP contains a stored cross-site script (XSS) vulnerability in the event graph preview feature. The event graph preview image field was accepted and stored without server-side validation. On the client side, the stored value was rendered into an HTML img element's src attribute via string concatenation, allowing a crafted value to break out of the attribute context and inject arbitrary script. Preconditions: - An authenticated MISP user with the ability to create or modify an event graph entry. - A second user (the victim) who views the event graph and triggers the preview popover. Impact: - Execution of arbitrary JavaScript in the victim's browser within the MISP application context. - Potential theft of session tokens, cookies, or sensitive data accessible to the victim's browser. - Potential for performing actions on behalf of the victim within the MISP application. Affected: MISP versions prior to the fix (commit applied after v2.5.48).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:H/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-2026-103321

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III. Intelligence Information for CVE-2026-103321

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Patches & Fixes for CVE-2026-103321 (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-2026-103388 6.2 MEDIUM MISP Stored Cross-Site Scripting via JavaScript URL in Galaxy Cluster Source Field
CVE-2026-103389 6.2 MEDIUM MISP Stored Cross-Site Scripting via Unvalidated Galaxy Icon Field in Correlation Graph

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-103321

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