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CVE-2026-104900— MISP Stored XSS via Unescaped Count Field Value in Remote Event Preview Index

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 在远程事件预览的索引表渲染中存在存储型跨站脚本（XSS）漏洞。计数字段模板对关联的链接 URL 进行了转义，但未对字段值进行 HTML 编码。具备在已链接（远程）MISP 服务器上创建或修改事件权限的攻击者，可以构造包含 HTML 或 JavaScript 标记的事件标识符。当本地 MISP 实例的用户查看远程事件预览索引时，未转义的值会直接在浏览器中渲染，从而允许在受害用户的会话中执行任意脚本。 前提条件： 已配置并连接到本地实例的已链接/远程 MISP 服务器。 攻击者在链接服务器上拥有足够的权限，能

CVSS 5.3 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
MISP MISP < 2.5.48 affected
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I. Basic Information for CVE-2026-104900

Vulnerability Information
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Vulnerability Title
MISP Stored XSS via Unescaped Count Field Value in Remote Event Preview Index
Source: CVE Program / CVE List V5
Vulnerability Description
MISP contains a stored cross-site scripting (XSS) vulnerability in the index table rendering of the remote event preview. The count field template escaped the associated link URL but rendered the field value without HTML encoding. An attacker with the ability to create or modify events on a linked (remote) MISP server could craft an event identifier containing HTML or JavaScript markup. When a user on the local MISP instance views the remote event preview index, the unescaped value is rendered directly in the browser, allowing arbitrary script execution in the victim's session. Preconditions: - A linked/remote MISP server is configured and connected to the local instance. - The attacker has sufficient access on the linked server to create or modify an event with a crafted identifier. - A victim user on the local instance views the remote event preview index page. Impact: - Execution of arbitrary JavaScript in the context of the MISP web application. - Potential session hijacking, data exfiltration, or unauthorized actions performed on behalf of the authenticated user. 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:N/VC:N/VI:N/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 ~ 2.5.48 cpe:2.3:a:misp:misp:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-104900

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III. Intelligence Information for CVE-2026-104900

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Patches & Fixes for CVE-2026-104900 (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-2026-104910 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
CVE-2026-104907 4.8 MEDIUM MISP: JavaScript Injection via Remote Tag ID in Event Preview Inline Handler

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-104900

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