# CVE-2026-91825

## Summary

- **CVE ID:** CVE-2026-91825
- **Severity:** HIGH
- **CVSS Score:** 7.1 (CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-862
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 15, 2026

## Description

Affected versions of MISP fail to authorize a submitted sharing group in a specific event-edit path.


The vulnerable logic checked whether the acting user could use a sharing_group_id only when the request explicitly supplied distribution = 4. If the attacker instead omitted distribution but supplied a different sharing_group_id, that authorization branch was skipped. Later, MISP’s field-recovery logic restored the existing event distribution from storage. For events already configured with sharing-group distribution, the unauthorized sharing-group ID could therefore be saved.


The fix adds authorization checks in both the controller and Event::_edit() whenever a non-empty sharing_group_id is supplied without distribution. The model now calls SharingGroup::checkIfAuthorised() before persisting the change.



Version affected: ≤2.5.45

## Affected Products

- MISP — MISP (0)

## References

- [CNA](https://github.com/MISP/MISP/commit/cf3ee4026)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.24%
- **EPSS Percentile:** 15.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._