CVE-2026-81820
MediumCVSS 5.1Summary
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, and 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.
Risk Assessment
The risk includes the possibility of injecting malicious HTML, including forms, which could lead to phishing attacks or other manipulations in the user interface. An attacker could exploit this to hijack sessions or steal data.
Recommendation
It is recommended to update Flowintel to a version containing the fix that uses safe DOM construction and assigns values via textContent. Also consider additional protections such as Content Security Policy.
Original NVD description (English source)
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