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CVE-2026-86440— MISP Dashboard Button Widget Allows Stored XSS via Unsafe javascript: and Backslash URLs

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.

以下是该漏洞描述的中文翻译： 受影响版本： MISP ≤ 2.5.45 受影响的 MISP 版本对仪表盘小组件（特别是按钮组件）所使用的 URL 验证不足。 组件的 URL 是用户可控的存储配置项。之前的渲染逻辑认为，如果 URL 看起来是相对路径，或者其解析出的主机名与配置中指定的 MISP 主机名匹配，则视为安全。然而，该逻辑未能拒绝对浏览器规范化处理与 PHP URL 解析存在差异的危险协议（scheme）和 URL 形式。 因此，诸如 协议 URL 或基于反斜杠的主机形式（authority forms）等

CVSS 5.1 · Medium

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript

Affected Version Matrix 1

VendorProduct Version RangeStatus
MISP MISP ≤ 2.5.45 affected
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I. Basic Information for CVE-2026-86440

Vulnerability Information
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Vulnerability Title
MISP Dashboard Button Widget Allows Stored XSS via Unsafe javascript: and Backslash URLs
Source: CVE Program / CVE List V5
Vulnerability Description
Affected versions of MISP insufficiently validate URLs used by dashboard widgets, particularly the Button widget. The widget's URL is stored configuration controlled by a user. The previous renderer considered a URL safe if it appeared relative or if its parsed hostname matched the configured MISP hostname. That logic failed to reject dangerous schemes and URL forms that browsers normalize differently from PHP's URL parsing. As a result, values such as javascript: URLs or backslash-based authority forms could reach the generated anchor's href and execute script or navigate to an attacker-controlled origin when another user interacted with the widget. The upstream commit describes the issue as: “javascript: and backslash URLs reached the href (stored XSS)”. The fix routes widget URLs through a shared DashboardURLValidator, rejects dangerous schemes, raw backslashes, control characters, and unauthorized absolute origins, and validates the URL both in the widget handler and renderer. Version affected: ≤2.5.45
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/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 ~ 2.5.45 -

II. Public POCs for CVE-2026-86440

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III. Intelligence Information for CVE-2026-86440

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Patches & Fixes for CVE-2026-86440 (1)

Same Patch Batch · MISP · 2026-09-07 · 11 CVEs total

CVE-2026-86452 8.7 HIGH MISP Unauthenticated Mail Endpoints Allow Unbounded Storage Consumption and Request Floodi
CVE-2026-86347 7.1 HIGH MISP Missing Authorization on Template File Upload Allows Authenticated Disk Exhaustion
CVE-2026-86408 7.1 HIGH MISP Missing Authorization in Cryptographic Key View Exposes Signing Keys from Protected E
CVE-2026-86419 7.0 HIGH MISP Insufficient Outbound URL Validation Allows SSRF and Credential Disclosure via Feed R
CVE-2026-86342 5.3 MEDIUM MISP Freetext Feed Preview Improper Authorization Exposes Restricted Event and Feed Inform
CVE-2026-86417 5.3 MEDIUM MISP Dashboard Template REST API Exposes Template Owner Email Addresses to Unauthorized Us
CVE-2026-86451 5.3 MEDIUM MISP Event Graph Object Reference Lookup Exposes References from Unauthorized Objects
CVE-2026-86351 5.1 MEDIUM MISP User Homepage Validation Allows Authenticated Open Redirect via Protocol-Relative URL
CVE-2026-86418 2.3 LOW MISP Dashboard Organisation Picker Exposes Hidden Organisation Metadata to Unauthorized Us
CVE-2026-86441 2.3 LOW MISP Dashboard Organisation Widgets Bypass Organisation-Index Restrictions and Expose Hidd

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-86440

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