CVE-2026-103388
MISP Stored Cross-Site Scripting via JavaScript URL in Galaxy Cluster Source Field
- State
- Published
- Severity
- 6.2 Medium
- Published
- Sep 30, 2026
- Updated
- Sep 30, 2026
- Reserved
- Sep 30, 2026
Description
MISP renders the source field of a Galaxy Cluster as a clickable hyperlink whenever the stored value passes PHP's FILTER_VALIDATE_URL validation. Because FILTER_VALIDATE_URL accepts the javascript: URI scheme, a user with galaxy editor privileges on the local instance or on a synced instance could store a javascript: URL as the cluster source.
When another user views the affected Galaxy Cluster and clicks the rendered link, the embedded script executes in the victim's browser context, enabling session hijacking, data exfiltration, or actions performed on behalf of the victim.
Preconditions:
- Attacker must hold galaxy editor privileges (local or via sync).
- Victim must view the affected cluster and click the malicious link.
Impact:
- Stored cross-site scripting (XSS) in the victim's browser.
- Potential session theft, credential harvesting, or unauthorized actions within the MISP application.
Affected: <2.5.48.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.2 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N | CIRCL |
Weaknesses
- CWE-79 Improper Neutralization of Input in Web Page ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
MISPMISP |
|
References
- Security patchpatch
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