CVE-2024-24988Network attack vector

Authenticated server crash via oversized custom-status emoji

Published Feb 29, 2024 · Updated Aug 1, 2024

Uncontrolled resource consumption in Mattermost allows remote authenticated users to crash the server via oversized custom-status emoji values. The custom-status update path accepts an unbounded emoji string and repeatedly processes attacker-supplied oversized values without enforcing a length limit. A logged-in user must repeatedly submit the values; resource consumption can degrade service or terminate the server process.

CVSS severity4.3
Medium
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in Mattermost allows remote authenticated users to crash the server via oversized custom-status emoji values. The custom-status update path accepts an unbounded emoji string and repeatedly processes attacker-supplied oversized values without enforcing a length limit. A logged-in user must repeatedly submit the values; resource consumption can degrade service or terminate the server process.

The record

CVE
CVE-2024-24988
Published
Feb 29, 2024
Updated
Aug 1, 2024
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 29, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=8.1.8
  2. Affected versionversion=0 <=9.2.4
  3. Affected versionversion=0 <=9.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mattermost · Mattermostversion=0 <=8.1.8; version=0 <=9.2.4; version=0 <=9.3.0

Published CVSS scores

4.3Mattermost, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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