CVE-2024-28949Network attack vector

Authenticated service interruption via unbounded preference batches

Published Apr 5, 2024 · Updated Sep 3, 2024

Uncontrolled resource consumption in affected Mattermost Server releases allows remote authenticated users to cause a service interrupt. The authenticated v4 preference update and delete handlers decode an unbounded JSON array and accept more than 100 preference objects per request. Any signed-in user can submit oversized preference batches, consuming server resources and degrading or interrupting service without affecting data confidentiality or integrity.

CVSS severity4.3
Medium
EPSS probability0.56%
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 affected Mattermost Server releases allows remote authenticated users to cause a service interrupt. The authenticated v4 preference update and delete handlers decode an unbounded JSON array and accept more than 100 preference objects per request. Any signed-in user can submit oversized preference batches, consuming server resources and degrading or interrupting service without affecting data confidentiality or integrity.

The record

CVE
CVE-2024-28949
Published
Apr 5, 2024
Updated
Sep 3, 2024
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-770, CWE-400, T1499.002
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 5, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=8.1.0 <=8.1.10
  2. Affected versionversion=9.3.0 <=9.3.2
  3. Affected versionversion=9.4.0 <=9.4.3
  4. Affected versionversion=9.5.0 <=9.5.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mattermost · Mattermostversion=8.1.0 <=8.1.10; version=9.3.0 <=9.3.2; version=9.4.0 <=9.4.3; version=9.5.0 <=9.5.1

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
6.5NISTCVSS: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-770Allocation of Resources Without Limits or Throttling
CWE-400Uncontrolled Resource Consumption
T1499.002Service Exhaustion

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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