CVE-2026-95659 MISP Reflected XSS via Unvalidated Object Type in AnalystData Overmind Thread
Authenticated attackers can inject JavaScript via crafted URLs in MISP, potentially stealing session data or performing actions on behalf of victims.
- 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-2026-95659?
CVE-2026-95659 is a medium-severity cross-site scripting vulnerability in MISP, published on 22 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 reflected cross-site scripting (XSS) vulnerability in the AnalystDataController::viewForObject action. The method accepted a parent object type parameter from the URL without validation and passed it to the Overmind-themed AnalystData thread view element, where it was interpolated into two translated strings and rendered into the HTML response without output encoding. An authenticated attacker who can induce a victim to navigate to a crafted URL can inject arbitrary JavaScript that executes in the victim's browser within the MISP application context. This may allow the attacker to read session data, manipulate the page, or perform actions on behalf of the victim.
The vulnerability requires the victim to be authenticated to MISP and to actively visit the attacker-supplied URL. The affected component is the AnalystData controller and the Overmind theme's AnalystData thread element.
Version affected: <2.5.47
Which versions are affected by CVE-2026-95659?
How do I fix CVE-2026-95659?
No fix has been published for CVE-2026-95659 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-2026-95659 being exploited?
There is no known exploitation of CVE-2026-95659 in the wild and no public exploit code.
Sources
Also known as GHSA-296v-9jwc-w27h.