Executive brief
MISP is an open-source threat intelligence platform used by organizations to share and analyze cyber threat data. The Overmind theme contains a stored XSS vulnerability in dashboard statistics views where malicious code can be injected through object or category names and executed when other users view the dashboard. An authenticated attacker could hijack sessions, steal sensitive threat intelligence data, or perform unauthorized actions on behalf of victims.
Technical details
The vulnerability is a stored cross-site scripting (XSS) flaw in the Overmind theme's event General card and server/feed preview card components. The vulnerable code directly concatenates object names and category keys into innerHTML strings without HTML-encoding, allowing script injection. An attacker with low-level authenticated access to create or modify MISP objects can craft a name containing malicious markup; when any other user views the affected dashboard pages, the injected JavaScript executes in the victim's browser context. The fix involves passing legend label sinks through an escapeHtml function to prevent markup interpretation.
Affected products
- MISP MISP
Timeline
- 2026-09-17: disclosed
- 2026-09-17: patched: Fix committed to repository (commit 382188d)