CVE-2022-2406Network attack vector

Authenticated server crash via oversized Slack import

Published Jul 14, 2022 · Updated Dec 6, 2024

Uncontrolled resource consumption in Mattermost 6.7.0 and earlier allows remote authenticated users to crash the server via Slack imports. The legacy Slack import REST API accepts imported files without enforcing adequate size limits, allowing oversized content to exhaust server resources. A valid account and access to the legacy import endpoint are required; successful exploitation interrupts service by crashing the server.

CVSS severity6.5
Medium
EPSS probability0.86%
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 6.7.0 and earlier allows remote authenticated users to crash the server via Slack imports. The legacy Slack import REST API accepts imported files without enforcing adequate size limits, allowing oversized content to exhaust server resources. A valid account and access to the legacy import endpoint are required; successful exploitation interrupts service by crashing the server.

The record

CVE
CVE-2022-2406
Published
Jul 14, 2022
Updated
Dec 6, 2024
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-770, CWE-400, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 14, 2022CVE publishedPublication date reported by the CVE source.
  2. Dec 6, 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=6.4.x
  2. Affected versionversion=6.5.x <=6.5.1
  3. Affected versionversion=6.6.x <=6.6.1
  4. Affected versionversion=6.7.x 6.7.0
  5. Affected versionversion=unspecified <=6.3.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mattermost · Mattermostversion=6.4.x; version=6.5.x <=6.5.1; version=6.6.x <=6.6.1; version=6.7.x 6.7.0; version=unspecified <=6.3.8

Published CVSS scores

4.3Mattermost CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
6.5NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.0NVDAV:N/AC:L/Au:S/C:N/I:N/A:P

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
T1499Endpoint Denial of Service

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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