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
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
Metrics
Affected Vendors & Products
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Advisories
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Fixes
Solution
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Workaround
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References
History
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 |
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| Metrics |
cvssV4_0
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Projects
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MITRE
Status: PUBLISHED
Assigner: CIRCL
Published:
Updated: 2026-08-27T12:06:18.177Z
Reserved: 2026-08-27T12:06:16.476Z
Link: CVE-2026-81753
Vulnrichment
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NVD
Status : Received
Published: 2026-08-27T13:18:43.637
Modified: 2026-08-27T13:18:43.637
Link: CVE-2026-81753
Redhat
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OpenCVE Enrichment
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Weaknesses