# CVE-2026-104900: MISP stored XSS in remote event preview index

Source: https://junglewise.ai/threats/cve-2026-104900-misp-contains-a-stored-cross-site-scripting-xss-vulnerability-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-02. Updated: 2026-10-05  
License: CC BY 4.0 with a link back

CVE-2026-104900 · Severity: info · Published 2026-10-02

MISP is an open-source threat intelligence platform that organizations use to share and manage security event data. A stored cross-site scripting vulnerability in the remote event preview allows an attacker with access to a linked MISP server to inject malicious scripts that execute when other users view event previews, potentially compromising user sessions and enabling account takeover or data theft.

Technologies: [MISP Project MISP](https://junglewise.ai/threats/technologies/misp-project-misp). Vendors: [MISP Project](https://junglewise.ai/threats/vendors/misp-project).

## Quick answers

**Is CVE-2026-104900 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-104900 being exploited in the wild.

**How severe is CVE-2026-104900?** Informational severity, published 2 October 2026.

**Which products and versions are affected?** MISP Project MISP before 2.5.48.

**Is there a fix for CVE-2026-104900?** Yes: fixed in 2.5.48. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-104900 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-104900?** Check whether you run MISP Project 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.

## How to fix

- Fixed in 2.5.48

## Technical details

A stored XSS vulnerability exists in the count field template of the index table rendering for remote event previews. The template properly escapes the link URL but fails to HTML-encode the field value before rendering it directly to the browser. An attacker with event modification privileges on a linked remote MISP server can craft an event identifier containing HTML or JavaScript markup, which executes in the victim's browser session when viewing the remote event preview index.

## Affected products

- MISP Project MISP before 2.5.48

## Timeline

- 2026-10-02: disclosed

## References

- [https://github.com/MISP/MISP/commit/2a2981a27](https://github.com/MISP/MISP/commit/2a2981a27)

## Related threats

- [MISP module plugin settings flags not preserved](https://junglewise.ai/threats/cve-2026-112192-misp-contains-a-vulnerability-in-the-handling-of-module-plugin)
- [MISP server settings information disclosure](https://junglewise.ai/threats/cve-2026-112188-misp-contains-a-vulnerability-in-its-server-settings-lookup)
- [MISP reflected XSS in workflow module interface](https://junglewise.ai/threats/cve-2026-112184-misp-contains-a-reflected-cross-site-scripting-xss-vulnerability)
- [MISP data integrity flaw in event deletion logic](https://junglewise.ai/threats/cve-2026-112180-misp-contains-a-data-integrity-flaw-in-its-event-deletion-logic)
- [MISP event synchronization information disclosure via tag filtering](https://junglewise.ai/threats/cve-2026-112179-in-misp-the-event-synchronization-process-contained-a-logic)