# CVE-2026-103235: MISP mass assignment vulnerability in event delegation

Source: https://junglewise.ai/threats/cve-2026-103235-misp-contains-a-mass-assignment-vulnerability-in-the-event  
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-2026-103235 · Severity: info · Published 2026-09-30

MISP is an open-source threat intelligence sharing platform. A flaw in the event delegation feature allows an authenticated user with delegation permissions to redirect existing delegation requests to arbitrary events, potentially granting unauthorized read access to events from other organizations or transferring event ownership. Exploitation requires delegation to be enabled on the instance and an authenticated user account with the delegation permission.

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-2026-103235 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-103235 being exploited in the wild.

**How severe is CVE-2026-103235?** Informational severity, published 30 September 2026.

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

**Is there a fix for CVE-2026-103235?** A patch was published on 2026-09-25. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-103235 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-103235?** 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.

## Technical details

The delegateEvent() function authorizes access only to the event specified in the URL, but then persists the entire caller-submitted request payload without validation, allowing an attacker to inject or modify fields like the primary key and event_id to retarget the delegation. Since a delegation row grants its organization read access to the referenced event, this allows unauthorized access to any event; if the target organization accepts the delegation, ownership transfers and the original record is deleted. The fix restricts persisted fields to an allow-list.

## Affected products

- MISP Project MISP < 2.5.48

## Timeline

- 2026-09-30: disclosed
- 2026-09-25: patched

## References

- [https://github.com/MISP/MISP/commit/d1f5684f9](https://github.com/MISP/MISP/commit/d1f5684f9)

## 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)