# CVE-2026-103389: MISP stored cross-site scripting in galaxy icon handling

Source: https://junglewise.ai/threats/cve-2026-103389-misp-contains-a-stored-cross-site-scripting-xss-vulnerability-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-30. Updated: 2026-09-30  
License: CC BY 4.0 with a link back

CVE-2026-103389 · Severity: info · Published 2026-09-30

MISP is a threat intelligence platform that aggregates and shares malware indicators and threat data. A user with basic permissions could inject malicious scripts into galaxy icon fields, which would then execute in the browsers of other users viewing correlation graphs. This allows attackers to steal session credentials, manipulate displayed data, or perform unauthorized actions on behalf of victims.

Technologies: [Misp](https://junglewise.ai/threats/technologies/misp). Vendors: [Misp](https://junglewise.ai/threats/vendors/misp).

## Quick answers

**Is CVE-2026-103389 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-103389 being exploited in the wild.

**How severe is CVE-2026-103389?** Informational severity, published 30 September 2026.

**Which products and versions are affected?** Misp before 2.5.48.

**Is there a fix for CVE-2026-103389?** A patch was published on 2026-09-25: Fix committed to repository Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-103389 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-103389?** Check whether you run Misp at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

Stored XSS in the galaxy object icon field due to lack of server-side validation in the galaxies/add, galaxies/edit, and sync/import capture endpoints. The unsanitized icon value is concatenated into HTML markup via D3's .html() method in correlation graph rendering scripts. A user with the perm_galaxy_editor permission (granted to the stock User role) can store arbitrary HTML/JavaScript that executes in the session context of any user viewing an event containing a cluster from that galaxy.

## Affected products

- MISP MISP before 2.5.48

## Timeline

- 2026-09-30: disclosed
- 2026-09-25: patched: Fix committed to repository

## References

- [https://github.com/MISP/MISP/commit/8ea5783dd](https://github.com/MISP/MISP/commit/8ea5783dd)

## Related threats

- [MISP CSS injection in remote event preview](https://junglewise.ai/threats/cve-2026-112183-misp-contains-a-css-injection-vulnerability-in-the-remote-event)
- [MISP access control flaw in proposal visibility logic](https://junglewise.ai/threats/cve-2026-112178-misp-contains-an-access-control-flaw-in-the-proposal-shadow)
- [MISP authorization flaw in correlation handling](https://junglewise.ai/threats/cve-2026-104912-misp-contains-an-authorization-flaw-in-its-correlation-handling)
- [MISP improper input validation in decaying model import](https://junglewise.ai/threats/cve-2026-104908-misp-contains-an-improper-input-validation-vulnerability-in-the)
- [MISP reflected XSS in taxonomy tag confirmation forms](https://junglewise.ai/threats/cve-2026-103662-misp-contains-a-reflected-cross-site-scripting-xss-vulnerability)