CVE-2024-39772Network attack vector

Silent screenshot capture via exposed JavaScript APIs

Published Sep 16, 2024 · Updated Sep 16, 2024

Improper access control in Mattermost Desktop App 5.8.0 and earlier allows remote attackers to capture screenshots through JavaScript APIs. Mattermost has not published the code locus or missing authorization check that exposes Electron screen-capture functionality. Reachability requires attacker-controlled JavaScript to execute in the desktop app; the bounded consequence is silent capture of visible screen content.

CVSS severity3.7
Low
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Mattermost Desktop App 5.8.0 and earlier allows remote attackers to capture screenshots through JavaScript APIs. Mattermost has not published the code locus or missing authorization check that exposes Electron screen-capture functionality. Reachability requires attacker-controlled JavaScript to execute in the desktop app; the bounded consequence is silent capture of visible screen content.

The record

CVE
CVE-2024-39772
Published
Sep 16, 2024
Updated
Sep 16, 2024
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-284, T1113
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 16, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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 <=5.8.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mattermost · Mattermostversion=0 <=5.8.0

Published CVSS scores

3.7Mattermost, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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 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-284Improper Access Control
T1113Screen Capture

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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