CVE-2026-93296 MISP Overmind: Stored Cross-Site Scripting via Unescaped Object Names in Statistics Legends
An attacker with low-level access can inject malicious scripts into MISP Overmind statistics legends, leading to session hijacking or data exfiltration when victims view the dashboard.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-93296?
CVE-2026-93296 is a high-severity cross-site scripting vulnerability in misp, published on 17 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
MISP contains a stored cross-site scripting (XSS) vulnerability in the Overmind theme's statistics views. The event General card and the server/feed preview card constructed donut chart legend labels by directly concatenating object name or category keys into an innerHTML string without HTML-encoding. Because MISP object names are user-controllable by any authenticated user with sufficient permissions to create or modify such objects, an attacker could craft a name containing malicious markup. When any other user viewed the affected Overmind dashboard, the injected markup would be interpreted as live HTML/JavaScript in the victim's browser, executing in the context of the MISP application origin. This could allow session hijacking, data exfiltration, or arbitrary actions performed on behalf of the victim.
The vulnerability requires the attacker to have low-level authenticated access to create or rename an object whose name is rendered in the legend, and the victim to view the Overmind event or server preview page. No special browser conditions or race conditions are required.
Weakness: CWE-79
Which versions are affected by CVE-2026-93296?
How do I fix CVE-2026-93296?
No fix has been published for CVE-2026-93296 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-93296 being exploited?
There is no known exploitation of CVE-2026-93296 in the wild and no public exploit code.
Sources
Also known as GHSA-rfmv-f8jw-7mhw.