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CVE-2026-81753— Flowintel Stored XSS in Case Notes via Malicious Mermaid Diagram Content

Quick assessment

Affected
flowintel flowintel
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.

以下是该漏洞描述信息的中文翻译： 漏洞描述： 受影响版本的 Flowintel 在渲染存储于案件备注（case notes）中的 Mermaid 代码块时，未对攻击者可控的标记内容（markup）进行充分中和（neutralize）。由于 Mermaid 备注内容会被持久化存储并稍后为其他用户渲染，拥有创建或编辑备注权限的攻击者可以存储一个特制的 Mermaid 负载（payload），当另一位用户查看该受影响的案件备注时，该负载将导致 JavaScript 执行。 修复方式： 补丁在返回生成的 Mermaid 包

CVSS 5.1 · Medium
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I. Basic Information for CVE-2026-81753

Vulnerability Information
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Vulnerability Title
Flowintel Stored XSS in Case Notes via Malicious Mermaid Diagram Content
Source: CVE Program / CVE List V5
Vulnerability Description
Affected versions of Flowintel render Mermaid blocks contained in stored case notes without sufficiently neutralizing attacker-controlled markup. Because Mermaid note content is persisted and later rendered for other users, an attacker with permission to create or edit a note could store a crafted Mermaid payload that results in JavaScript execution when another user views the affected case note. The patch adds explicit Mermaid detection and HTML escaping around the token content before the generated Mermaid wrapper is returned. It also moves the wrapping logic earlier in page initialization so Markdown instances are protected consistently. Version impacted >= 3.3.0
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
flowintel flowintel 0 ~ 3.3.0 -

II. Public POCs for CVE-2026-81753

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III. Intelligence Information for CVE-2026-81753

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Patches & Fixes for CVE-2026-81753 (1)

Same Patch Batch · flowintel · 2026-08-27 · 11 CVEs total

CVE-2026-81826 9.1 CRITICAL Flowintel Fails to Invalidate Active Sessions After Password Change
CVE-2026-81662 8.6 HIGH Flowintel Alert Settings Configuration Allows Remote Code Execution via Arbitrary Configur
CVE-2026-81818 8.6 HIGH Flowintel Organization Administrator Can Reset Full Administrator Password and Escalate Pr
CVE-2026-81743 7.5 HIGH Flowintel Arbitrary Log File Path Allows Remote Code Execution via Template Injection
CVE-2026-81817 7.2 HIGH Flowintel Missing Task-to-Case Authorization Allows Cross-Case Task Modification
CVE-2026-81659 7.1 HIGH Flowintel Note PDF Export Allows Arbitrary Local File Read via Pandoc/XeLaTeX Processing
CVE-2026-81827 6.9 MEDIUM Flowintel Login Email Validation Bypass Allows Log Injection via Crafted Email Input
CVE-2026-81819 5.3 MEDIUM Flowintel Missing Authorization Allows Regular API Users to View Other Users’ Task Assignm
CVE-2026-81814 5.1 MEDIUM Flowintel Stored XSS in Calendar via Malicious Case Title
CVE-2026-81820 5.1 MEDIUM Flowintel HTML Injection in MISP Case History Timeline via Crafted Object Attributes

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-81753

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