CVE-2023-1774Network attack vector

Private-channel access via unchecked inviter permissions

Published Mar 31, 2023 · Updated Dec 6, 2024

Missing authorization in Mattermost allows remote authenticated users to join private channels they cannot access via email invites. The email-invitation path fails to verify that the inviter has permission to the requested private channel before adding the invitee. A valid account and knowledge of the team and channel are required; successful abuse grants channel membership and access to its content.

CVSS severity4.2
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Mattermost allows remote authenticated users to join private channels they cannot access via email invites. The email-invitation path fails to verify that the inviter has permission to the requested private channel before adding the invitee. A valid account and knowledge of the team and channel are required; successful abuse grants channel membership and access to its content.

The record

CVE
CVE-2023-1774
Published
Mar 31, 2023
Updated
Dec 6, 2024
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-862, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 31, 2023CVE 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=0 <=7.1.5
  2. Affected versionversion=0 <=7.7.1
  3. Affected versionversion=0 <7.8.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mattermost · Mattermostversion=0 <=7.1.5; version=0 <=7.7.1; version=0 <7.8.0

Published CVSS scores

4.2Mattermost, Inc.CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

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-862Missing Authorization
T1190Exploit Public-Facing Application

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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