CVE-2026-104901 MISP ID Translator: Unescaped Remote Event ID Enables Cross-Site Scripting via Linked Server
An attacker controlling a linked MISP server can inject malicious scripts into the ID Translator page, potentially hijacking sessions of authenticated users.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-104901?
CVE-2026-104901 is a medium-severity cross-site scripting vulnerability in MISP, published on 2 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
MISP contains a cross-site scripting (XSS) vulnerability in the ID Translator feature. When a user views the ID Translator page, the application queries linked (remote) MISP servers for corresponding event identifiers. The event ID returned by the remote server was rendered in the HTML output without proper output encoding.
A malicious or compromised linked server could return a crafted event ID containing arbitrary HTML or JavaScript markup. This markup would be rendered in the browser of any user in the host organization who views the ID Translator page, enabling session hijacking, credential theft, or other client-side attacks.
Preconditions:
- The victim must be an authenticated user of the host MISP instance.
- A linked server must be configured on the host instance.
- The victim must navigate to the ID Translator page for a given event.
Affected versions: <2.5.48.
Weakness: CWE-79
Which versions are affected by CVE-2026-104901?
How do I fix CVE-2026-104901?
No fix has been published for CVE-2026-104901 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-2026-104901 being exploited?
There is no known exploitation of CVE-2026-104901 in the wild and no public exploit code.
Sources
Also known as GHSA-gw6q-xmmq-vqpx.