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CVE-2026-104907— MISP: JavaScript Injection via Remote Tag ID in Event Preview Inline Handler

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 在远程事件预览页面中存在跨站脚本（XSS）漏洞。当配置并连接了关联的（远程）MISP 服务器时，事件预览功能会将标签标识符渲染到内联 JavaScript 的 属性中。虽然标签 ID 值经过了 HTML 转义处理，但未针对 JavaScript 字符串上下文进行适当的清理。这意味着，恶意关联服务器可以提供一个包含特殊字符（例如单引号）的标签 ID，这些字符可以跳出 JavaScript 字符串字面量，从而注入任意脚本。 前提条件： 已配置并连接到本地实例的关联/远程 MISP 服务器。 关联服务器在事件中

CVSS 4.8 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
MISP MISP < 2.5.48 affected
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I. Basic Information for CVE-2026-104907

Vulnerability Information
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Vulnerability Title
MISP: JavaScript Injection via Remote Tag ID in Event Preview Inline Handler
Source: CVE Program / CVE List V5
Vulnerability Description
MISP contains a cross-site scripting (XSS) vulnerability in the remote event preview page. When a linked (remote) MISP server is configured, the event preview renders tag identifiers inside an inline JavaScript onclick attribute. The tag ID value was HTML-escaped but not sanitized for the JavaScript string context, meaning a malicious linked server could supply a tag ID containing characters (such as a single quote) that break out of the JavaScript string literal and inject arbitrary script. Preconditions: - A linked/remote MISP server is configured and connected to the local instance. - The linked server supplies a crafted tag ID in an event. - An authenticated user views the event preview and interacts with the affected tag element. Impact: - Arbitrary JavaScript execution in the context of the viewing user's browser session, potentially allowing session hijacking, data exfiltration, or unauthorized actions on behalf of the user. Affected versions: MISP prior to the fix commit (v2.5.48 or later, exact boundary unconfirmed).
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:N/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 ~ 2.5.48 cpe:2.3:a:misp:misp:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-104907

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III. Intelligence Information for CVE-2026-104907

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Patches & Fixes for CVE-2026-104907 (1)

Same Patch Batch · MISP · 2026-10-02 · 8 CVEs total

CVE-2026-104908 7.1 HIGH MISP Decaying Model Import Mass Assignment Allows Cross-Organization Model Overwrite and D
CVE-2026-104912 7.1 HIGH MISP Correlation Authorization Bypass Exposes Restricted Event and Attribute Data
CVE-2026-104906 6.2 MEDIUM MISP TAXII Object Viewer Stored XSS via Unescaped JSON Output
CVE-2026-104900 5.3 MEDIUM MISP Stored XSS via Unescaped Count Field Value in Remote Event Preview Index
CVE-2026-104910 5.3 MEDIUM MISP Information Disclosure via Related Events Listing Bypassing Per-Event Authorization
CVE-2026-104914 5.3 MEDIUM MISP: Soft-Deleted Attributes from Other Organizations Exposed via Attribute Search and Pa
CVE-2026-104901 5.1 MEDIUM MISP ID Translator: Unescaped Remote Event ID Enables Cross-Site Scripting via Linked Serv

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-104907

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