CVE-2026-103389: MISP Stored Cross-Site Scripting via Unvalidated Galaxy Icon Field in Correlation Graph
MISP contains a stored cross-site scripting (XSS) vulnerability in the galaxy icon handling path. The icon field of a galaxy object was persisted without any server-side validation through the galaxy add, edit, and sync/import capture endpoints. The stored value was subsequently concatenated directly into HTML markup by the D3-based correlation graph rendering scripts (both the default and Overmind themes) using the .html() method.
A user holding the permgalaxyeditor permission, which is granted to the stock User role, could store arbitrary HTML or JavaScript in the icon field. Any other user who opened the correlation graph of an event containing a cluster belonging to that galaxy would have the injected script executed in their browser session.
Impact:
- Arbitrary script execution in the context of the victim's MISP session
- Potential theft of session credentials, manipulation of displayed data, or initiation of actions on behalf of the victim
- Affects both the default and Overmind UI themes
Affected versions: <2.5.48
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
MISPto a version that resolves this vulnerability.Fixed in 2.5.48
Event History
Frequently Asked Questions
Who can inject the malicious content, and who is exposed when it is rendered?
A user with the perm_galaxy_editor permission can store a malicious galaxy icon value; this permission is granted to the stock User role. Any user who opens the correlation graph for an event containing a cluster from the affected galaxy can have script executed in their MISP browser session.
Which workflows and interface configurations are affected?
The vulnerable icon value can be persisted through galaxy add, edit, and sync/import capture endpoints. Rendering is affected in the correlation graph under both the default and Overmind themes.
What is the immediate mitigation if an upgrade is not yet possible?
Restrict perm_galaxy_editor to trusted users and review galaxy icon values for unexpected HTML or JavaScript. Avoid opening correlation graphs for events that include clusters from untrusted galaxies until malicious stored values are removed.
How can administrators identify potentially affected deployments?
Deployments running versions earlier than 2.5.48 are affected. Inspect galaxy icon fields, including content introduced through synchronization or imports, for HTML or JavaScript rather than expected icon data.