CVE-2022-2366Network attack vector

Rate-limit bypass via trusted proxy header defaults

Published Jul 11, 2022 · Updated Dec 6, 2024

Incorrect trusted-IP-header defaults in Mattermost 6.7.0 and earlier allow remote attackers to bypass rate limits and falsify audit IPs. The ServiceSettings.TrustedProxyIPHeader default remains nonempty in affected configurations, so the server trusts request-supplied proxy headers as client addresses. No authentication is required; crafted headers can evade IP-keyed throttling or place false source addresses in audit records.

CVSS severity5.6
Medium
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect trusted-IP-header defaults in Mattermost 6.7.0 and earlier allow remote attackers to bypass rate limits and falsify audit IPs. The ServiceSettings.TrustedProxyIPHeader default remains nonempty in affected configurations, so the server trusts request-supplied proxy headers as client addresses. No authentication is required; crafted headers can evade IP-keyed throttling or place false source addresses in audit records.

The record

CVE
CVE-2022-2366
Published
Jul 11, 2022
Updated
Dec 6, 2024
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-276, T1562.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 11, 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

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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=6.5.x <=6.5.1
  2. Affected versionversion=6.6.x <=6.6.1
  3. Affected versionversion=6.7.x 6.7.0
  4. Affected versionversion=6.x <=6.3.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mattermost · Mattermostversion=6.5.x <=6.5.1; version=6.6.x <=6.6.1; version=6.7.x 6.7.0; version=6.x <=6.3.8

Published CVSS scores

5.0NVDAV:N/AC:L/Au:N/C:N/I:P/A:N
5.3NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
5.6Mattermost, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-276Incorrect Default Permissions
T1562.001Impair Defenses: Disable or Modify Tools

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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