CVE-2023-2792Network attack vector

Private message disclosure via unsanitized error previews

Published Jun 16, 2023 · Updated Dec 6, 2024

Information disclosure in Mattermost 7.10.0 and earlier allows remote authenticated users to read arbitrary messages via /groupmsg. The /groupmsg handler fails to sanitize ephemeral error messages before permalink previews resolve embedded message references, returning content from channels the requester cannot access. A valid Mattermost account and a crafted slash command are required; the consequence is read-only disclosure of message content, not message modification or service interruption.

CVSS severity6.5
Medium
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Mattermost 7.10.0 and earlier allows remote authenticated users to read arbitrary messages via /groupmsg. The /groupmsg handler fails to sanitize ephemeral error messages before permalink previews resolve embedded message references, returning content from channels the requester cannot access. A valid Mattermost account and a crafted slash command are required; the consequence is read-only disclosure of message content, not message modification or service interruption.

The record

CVE
CVE-2023-2792
Published
Jun 16, 2023
Updated
Dec 6, 2024
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-200, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 16, 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 <=7.1.9
  2. Affected versionversion=0 <=7.8.4
  3. Affected versionversion=0 <=7.9.3
  4. Affected versionversion=7.10.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mattermost · Mattermostversion=0 <=7.1.9; version=0 <=7.8.4; version=0 <=7.9.3; version=7.10.0

Published CVSS scores

6.5Mattermost, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/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-200Exposure of Sensitive Information to an Unauthorized Actor
T1213Data from Information Repositories

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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