### [CVE-2024-29977](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-29977)
![](https://img.shields.io/static/v1?label=Product&message=Mattermost&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=9.5.0%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=9.9.0%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-284%3A%20Improper%20Access%20Control&color=brightgreen)

### Description

Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6 fail to properly validate synced reactions, when shared channels are enabled, which allows a malicious remote to create arbitrary reactions on arbitrary posts

### POC

#### Reference
- https://mattermost.com/security-updates

#### Github
- https://github.com/fkie-cad/nvd-json-data-feeds