Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

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.

flowintel是flowintel团队开源的一款威胁情报与威胁分析管理平台。 flowintel 3.3.0及之前版本存在跨站脚本漏洞，该漏洞源于未充分中和存储的案例笔记中Mermaid块的攻击者控制标记，可能导致跨站脚本攻击。

CVSS 5.1 · Medium EPSS 0.55% · P44

Affected Version Matrix 1

VendorProduct Version RangeStatus
flowintel flowintel ≤ 3.3.0 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-81753

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

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
Vulnerability Title
flowintel 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
flowintel是flowintel团队开源的一款威胁情报与威胁分析管理平台。 flowintel 3.3.0及之前版本存在跨站脚本漏洞，该漏洞源于未充分中和存储的案例笔记中Mermaid块的攻击者控制标记，可能导致跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
flowintel flowintel 0 ~ 3.3.0 -

II. Public POCs for CVE-2026-81753

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-81753

请登录查看更多情报信息。

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

No comments yet

Leave a comment