CVE-2026-103388

Published: Set 30, 2026 Last Modified: Set 30, 2026
ExploitDB:
Other exploit source:
Google Dorks:
MEDIUM 6,2
Source: 5a6e4751-2f3f-4070-9419-94fb35b644e8
Attack Vector: network
Attack Complexity: low
Privileges Required: low
User Interaction: active
Confidentiality: N/A
Integrity: N/A
Availability: N/A

Description

AI Translation Available

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.

79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Stable
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Access Control Confidentiality Integrity Availability
Potential Impacts:
Bypass Protection Mechanism Read Application Data Execute Unauthorized Code Or Commands
Applicable Platforms
Technologies: AI/ML, Web Based, Web Server
Likelihood of Exploit: High
View CWE Details
https://github.com/MISP/MISP/commit/118528767
https://github.com/MISP/MISP/commit/118528767