CVE-2026-103858

Published: Ott 01, 2026 Last Modified: Ott 01, 2026
ExploitDB:
Other exploit source:
Google Dorks:
MEDIUM 5,3
Source: 5a6e4751-2f3f-4070-9419-94fb35b644e8
Attack Vector: network
Attack Complexity: low
Privileges Required: low
User Interaction: none
Confidentiality: N/A
Integrity: N/A
Availability: N/A

Description

AI Translation Available

MISP contains an incomplete authorization check in the discussion posting functionality. When a user submits a post to a thread or replies to an existing post, the application only verified whether the target thread was restricted to a single organization (org-only distribution). It did not enforce the full thread access control list, including sharing-group membership and event-level visibility.

As a result, an authenticated user who is outside the relevant sharing group or who does not have visibility on the associated event could:

- Read the thread title and the content of the quoted post

- Submit a new post into the discussion thread

This constitutes both an information disclosure (reading restricted thread and post content) and an integrity issue (injecting content into a thread the user is not authorized to participate in).

Affected: <2.5.48

285

Improper Authorization

Draft
Abstraction: Class Structure: Simple
Common Consequences
Security Scopes Affected:
Confidentiality Integrity Access Control
Potential Impacts:
Read Application Data Read Files Or Directories Modify Application Data Modify Files Or Directories Gain Privileges Or Assume Identity Execute Unauthorized Code Or Commands
Applicable Platforms
Technologies: Not Technology-Specific, Web Server, Database Server
Likelihood of Exploit: High
View CWE Details
https://github.com/MISP/MISP/commit/79fbd4c75
https://github.com/MISP/MISP/commit/79fbd4c75