CVE-2026-81753 - Flowintel Stored XSS in Case Notes via Malicious Mermaid Diagram Content
CVE ID :CVE-2026-81753
Published : Aug. 27, 2026, 1:18 p.m. | 3 hours, 11 minutes ago
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
Severity: 5.1 | MEDIUM
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Published : Aug. 27, 2026, 1:18 p.m. | 3 hours, 11 minutes ago
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
Severity: 5.1 | MEDIUM
Visit the link for more details, such as CVSS details, affected products, timeline, and more...