GHSA-jq3g-xqpx-37x3
GitHub Security Advisory
Mattermost failed to properly validate synced reactions
✓ GitHub Reviewed
MODERATE
Has CVE
Advisory Details
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
Affected Packages
Go
github.com/mattermost/mattermost/server/v8
Affected versions:
9.5.0
(fixed in 9.5.7)
Go
github.com/mattermost/mattermost/server/v8
Affected versions:
9.9.0
(fixed in 9.9.1)
Related CVEs
Key Information
5.0
/10
Dataset
Last updated: August 2, 2025 6:46 AM
Data from GitHub Advisory Database. This information is provided for research and educational purposes.