CVE-2024-29977

Malicious remote can create arbitrary reactions on arbitrary posts

Published Aug 1, 2024 CVSS 3.1 · 2.7 Low EPSS < 1% KEV · Not listed
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

Remediation

Vendor Solution

Update Mattermost to versions 9.10.0, 9.9.1, 9.5.7 or higher.

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2024-2607 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
Github GHSA Github GHSA GHSA-jq3g-xqpx-37x3 Mattermost failed to properly validate synced reactions
References
History
Type Values Removed Values Added
First Time appeared Mattermost
Mattermost mattermost
Weaknesses NVD-CWE-noinfo
CPEs cpe:2.3:a:mattermost:mattermost:*:*:*:*:*:*:*:*
cpe:2.3:a:mattermost:mattermost:9.9.0:*:*:*:*:*:*:*
Vendors & Products Mattermost
Mattermost mattermost
Weaknesses

Sources

Status
PUBLISHED
Assigner
Mattermost
Published
Updated
Aug 1, 2024, 2:35 PM
Reserved
Jul 23, 2024, 7:00 PM
Status
Analyzed
Published
Aug 1, 2024, 3:15 PM
Modified
Jun 17, 2026, 7:23 AM