2.7

CVSS Score

3.1

-

CVSS Score

Basic Information

CVE ID

CVE-2024-29977

GHSA ID

GHSA-jq3g-xqpx-37x3

EPSS Score

0.31258%

CWE

CWE-284

Published

8/1/2024

Updated

11/18/2024

KEV Status

Technology

Basic Information

CVE ID

GHSA ID

EPSS Score

CWE

Published

Updated

KEV Status

Technology

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CVE-2024-29977

CVE-2024-29977: Mattermost failed to properly validate synced reactions

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 Advisory)

Miggo Vulnerability Database

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CVE-2024-29977

CVE-2024-29977:

2.7

CVSS Score

3.1

-

CVSS Score

Basic Information

CVE ID

CVE-2024-29977

GHSA ID

GHSA-jq3g-xqpx-37x3

EPSS Score

0.31258%

CWE

CWE-284

Published

8/1/2024

Updated

11/18/2024

KEV Status

Technology

Basic Information

CVE ID

GHSA ID

EPSS Score

CWE

Published

Updated

KEV Status

Technology

Technical Details

CVSS Vector

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

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
github.com/mattermost/mattermost/server/v8	go	>= 9.5.0, < 9.5.7	9.5.7
github.com/mattermost/mattermost/server/v8	go	= 9.9.0	9.9.1

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability stems from improper access control in reaction synchronization. Based on Mattermost's architecture:

SyncReaction would handle reaction synchronization logic
Shared channel services would process cross-server messages
The CWE-284 classification indicates missing authorization checks
The description suggests missing validation of remote reaction sources
Typical patterns show sync handlers in app/ and services/sharedchannel/ Confidence is medium due to lack of direct patch evidence, but matches the described vulnerability pattern and Mattermost's service structure.

Vulnerable functions

Only Mi**o us*rs **n s** t*is s**tion

WAF Protection Rules

WAF Rule

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Reasoning

*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.

2.7

-

Basic Information

Basic Information

Concerned about an active attack path?

CVE-2024-29977: Mattermost failed to properly validate synced reactions

CVE-2024-29977:

2.7

-

Basic Information

Basic Information

Technical Details

Technical Details

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

WAF Protection Rules

WAF Rule

Reasoning

Vulnerability IntelligenceMiggo AI

Basic Information

Basic Information

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

WAF Protection Rules

WAF Rule

Reasoning

2.7

2.7

CVE-2024-29977: Mattermost failed to properly validate synced reactions

Technical Details

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
Miggo AI