CVE-2024-29977

LOW

Mattermost 9.5.0-9.5.6 and 9.9.0 - Improper Access Control for Synced Reactions

Title source: llm

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

References (1)

Core 1

Core References

Vendor Advisory

https://mattermost.com/security-updates

Scores

CVSS v3 2.7

EPSS 0.0015

EPSS Percentile 35.9%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-284

Status published

Products (3)

mattermost/mattermost 9.9.0

mattermost/mattermost 9.5.0 - 9.5.7

mattermost/mattermost 9.5.0 - 9.5.7Go

Published Aug 01, 2024

Tracked Since Feb 18, 2026