CVE-2024-32939Network attack vector

Authenticated email disclosure via unredacted user props

Published Aug 22, 2024 · Updated Aug 22, 2024

Information disclosure in Mattermost 9.5, 9.8, 9.9, and 9.10 branches allows remote authenticated users to read hidden email addresses. Shared-channel remote-user synchronization stores each source email in the user's props map, and profile redaction fails to remove that value when email visibility is disabled. Shared channels must be enabled, and a signed-in user must be able to retrieve a synchronized remote profile; exposure is limited to the original email address.

CVSS severity4.3
Medium
EPSS probability0.22%
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 9.5, 9.8, 9.9, and 9.10 branches allows remote authenticated users to read hidden email addresses. Shared-channel remote-user synchronization stores each source email in the user's props map, and profile redaction fails to remove that value when email visibility is disabled. Shared channels must be enabled, and a signed-in user must be able to retrieve a synchronized remote profile; exposure is limited to the original email address.

The record

CVE
CVE-2024-32939
Published
Aug 22, 2024
Updated
Aug 22, 2024
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-284, CWE-312
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 22, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 22, 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=9.10.0
  2. Affected versionversion=9.5.0 <=9.5.7
  3. Affected versionversion=9.8.0 <=9.8.2
  4. Affected versionversion=9.9.0 <=9.9.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mattermost · Mattermostversion=9.10.0; version=9.5.0 <=9.5.7; version=9.8.0 <=9.8.2; version=9.9.0 <=9.9.1

Published CVSS scores

3.7NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
4.3MattermostCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
CWE-312Cleartext Storage of Sensitive Information

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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