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CVE-2026-81820

Flowintel HTML Injection in MISP Case History Timeline via Crafted Object Attributes

Published
Last modified
published
Not listed in CISA KEV
Fix
Fix or patch referenced
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

Summary

Affected versions of Flowintel construct timeline HTML using attacker-controllable MISP object fields such as: • object UUID; • object name; • attribute value; • attribute type; • comment; • first/last seen values; • IDS flag. Those values were concatenated directly into HTML strings before rendering. The upstream commit explicitly states that DOMPurify removed XSS vectors but still allowed other HTML elements, such as forms, through. The fix replaces direct string interpolation with DOM construction via document.createElement() and assigns all attacker-controlled values using textContent. The headline is similarly converted to escaped HTML through a temporary element. Version impacted =>3.3.0

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • flowintel flowintel

    through 3.3.0

References 1

GitHub · flowintel/flowintel