MISP Stored Cross-Site Scripting via JavaScript URL in Galaxy Cluster Source Field
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.
CVE-2026-103388
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-103388
MISP
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"cpes": [
"cpe:2.3:a:misp:misp:*:*:*:*:*:*:*:*"
],
"repo": "https://github.com/MISP/MISP",
"vendor": "MISP",
"modules": [
"GalaxyClusters view (default theme)",
"GalaxyClusters view (Overmind theme)"
],
"product": "MISP",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "2.5.48",
"versionType": "semver"
}
],
"programFiles": [
"app/View/GalaxyClusters/view.ctp",
"app/View/Themed/Overmind/Elements/GalaxyClusters/View/galaxy_clusters_general.ctp"
]
}
]- Related CVEs
- CVE-2026-103388
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #4491 · Revision 1
- Added to Heist Feed
- Publisher date