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CVE-2026-112183— MISP CSS Injection via Remote Tag Colour in Event Preview

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 在远程事件预览功能中存在 CSS 注入漏洞。当用户从关联的 MISP 服务器预览事件时，每个远程标签关联的颜色值会未经充分验证便直接写入内联 CSS 样式属性。尽管已应用 HTML 实体编码，但该值仍会在 style 属性内被解析为 CSS，从而允许恶意或已被攻陷的关联服务器注入任意 CSS 声明。 能够在关联的 MISP 实例上创建或修改标签的攻击者，可构造包含 CSS 注入载荷的标签颜色值。当本地实例上的用户查看事件预览时，注入的 CSS 将被渲染，可能导致用户界面被篡改、视觉欺骗，或通过基于 CSS

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-2026-112183

Vulnerability Information
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Vulnerability Title
MISP CSS Injection via Remote Tag Colour in Event Preview
Source: CVE Program / CVE List V5
Vulnerability Description
MISP contains a CSS injection vulnerability in the remote event preview feature. When a user previews an event from a linked MISP server, the colour value associated with each remote tag is written directly into an inline CSS style attribute without sufficient validation. Although HTML entity encoding is applied, the value is interpreted as CSS within the style attribute, allowing a malicious or compromised linked server to inject arbitrary CSS declarations. An attacker with the ability to create or modify tags on a linked MISP instance can craft a tag colour value containing CSS injection payloads. When a user on the local instance views the event preview, the injected CSS is rendered, potentially allowing UI manipulation, visual spoofing, or limited information disclosure through CSS-based techniques. Preconditions: - A linked MISP server relationship exists between the victim instance and the attacker-controlled instance. - The attacker can create or modify tags on the linked server. - A victim user views the remote event preview page. Affected: <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:L/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
输出中的特殊元素转义处理不恰当(注入)
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-2026-112183

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III. Intelligence Information for CVE-2026-112183

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Patches & Fixes for CVE-2026-112183 (1)

Same Patch Batch · MISP · 2026-10-19 · 7 CVEs total

CVE-2026-112178 7.1 HIGH MISP Proposal ACL Bypass: Incomplete Distribution Level Check in Shadow Attribute Access C
CVE-2026-112188 7.1 HIGH MISP Server Settings Lookup Exposes Sensitive Configuration Data via Branch Name Resolutio
CVE-2026-112179 5.3 MEDIUM MISP Event Synchronization Exposes Non-Exportable Tags on Remote Instances
CVE-2026-112192 5.3 MEDIUM MISP Module Settings Expose Redacted Values and Allow API Modification of CLI-Only Setting
CVE-2026-112180 5.1 MEDIUM MISP Incomplete Event Deletion Leaves Orphaned Sensitive Records
CVE-2026-112184 4.8 MEDIUM MISP Workflow Module: Reflected XSS via Unescaped misp-modules Parameter Names in Form Lab

IV. Related Vulnerabilities

Same product: MISP
Same vendor: MISP
Same weakness: CWE-74

V. Comments for CVE-2026-112183

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