CVE-2023-5920

Keyboard-input disclosure via disabled Secure Keyboard Entry

Published Nov 2, 2023 · Updated Feb 27, 2025

Information disclosure in Mattermost Desktop 5.5.0 and earlier on macOS allows local users to read keyboard input through another process. The desktop client leaves macOS Secure Keyboard Entry disabled while accepting keystrokes, allowing another local process to monitor the resulting input events. Exploitation requires a process running locally during keyboard use, and the disclosed consequence is capture of typed data rather than modification or service interruption.

CVSS severity2.9
Low
EPSS probability0.19%
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 Desktop 5.5.0 and earlier on macOS allows local users to read keyboard input through another process. The desktop client leaves macOS Secure Keyboard Entry disabled while accepting keystrokes, allowing another local process to monitor the resulting input events. Exploitation requires a process running locally during keyboard use, and the disclosed consequence is capture of typed data rather than modification or service interruption.

The record

CVE
CVE-2023-5920
Published
Nov 2, 2023
Updated
Feb 27, 2025
Vendor
Mattermost
Product
Mattermost Desktop
Classifications
CWE-200, T1056.001
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 2, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 27, 2025Record 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 <=5.5.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Mattermost · Mattermost Desktopversion=0 <=5.5.0

Published CVSS scores

3.3NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
2.9Mattermost, Inc.CVSS:3.1/AV:L/AC:H/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1056.001Keylogging

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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