CVE-2024-39767Network attack vector

Push-notification spoofing via unverified server identity

Published Jul 15, 2024 · Updated Aug 2, 2024

Improper authentication in Mattermost Mobile Apps 2.16.0 and earlier allows remote attackers to spoof another server's push notifications. The app accepts a notification's diagnostic ID or server URL without verifying that the sending server owns that identity, then attributes the notification to the referenced server. Exploitation requires a user to connect the app to a malicious server, resulting in misleading notification content and limited client disruption.

CVSS severity4.2
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Mattermost Mobile Apps 2.16.0 and earlier allows remote attackers to spoof another server's push notifications. The app accepts a notification's diagnostic ID or server URL without verifying that the sending server owns that identity, then attributes the notification to the referenced server. Exploitation requires a user to connect the app to a malicious server, resulting in misleading notification content and limited client disruption.

The record

CVE
CVE-2024-39767
Published
Jul 15, 2024
Updated
Aug 2, 2024
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-287, T1036
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 15, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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 <=2.16.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mattermost · Mattermostversion=0 <=2.16.0

Published CVSS scores

4.2Mattermost, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:L
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
T1036Masquerading

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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