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
Published: 2026-08-27
Score: 5.1 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Thu, 27 Aug 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 27 Aug 2026 15:00:00 +0000

Type Values Removed Values Added
First Time appeared Flowintel
Flowintel flowintel
Vendors & Products Flowintel
Flowintel flowintel

Thu, 27 Aug 2026 13:00:00 +0000

Type Values Removed Values Added
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
Title Flowintel Stored XSS in Case Notes via Malicious Mermaid Diagram Content
Weaknesses CWE-79
References
Metrics cvssV4_0

{'score': 5.1, 'vector': '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'}


Subscriptions

Flowintel Flowintel
cve-icon MITRE

Status: PUBLISHED

Assigner: CIRCL

Published:

Updated: 2026-08-27T15:54:32.566Z

Reserved: 2026-08-27T12:06:16.476Z

Link: CVE-2026-81753

cve-icon Vulnrichment

Updated: 2026-08-27T15:54:29.305Z

cve-icon NVD

Status : Received

Published: 2026-08-27T13:18:43.637

Modified: 2026-08-27T17:21:04.293

Link: CVE-2026-81753

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-27T16:00:15Z

Weaknesses