CVE-2023-3587Network attack vector

Hidden editor access via board state change

Published Jul 17, 2023 · Updated Oct 22, 2024

Missing authorization in Mattermost 7.10.2 and earlier allows remote authenticated users with system-administrator privileges to grant editor access. Boards permission-state handling accepts a change that grants link holders Editor membership while the sharing UI continues to display the prior access state. Exploitation requires system-administrator control and a valid sharing link; recipients can modify board content, with no reported confidentiality or availability impact.

CVSS severity2.7
Low
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Mattermost 7.10.2 and earlier allows remote authenticated users with system-administrator privileges to grant editor access. Boards permission-state handling accepts a change that grants link holders Editor membership while the sharing UI continues to display the prior access state. Exploitation requires system-administrator control and a valid sharing link; recipients can modify board content, with no reported confidentiality or availability impact.

The record

CVE
CVE-2023-3587
Published
Jul 17, 2023
Updated
Oct 22, 2024
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-862
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jul 17, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 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=0 <=7.10.2
  2. Affected versionversion=0 <=7.8.6
  3. Affected versionversion=0 <=7.9.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Mattermost · Mattermostversion=0 <=7.10.2; version=0 <=7.8.6; version=0 <=7.9.4

Published CVSS scores

2.7Mattermost, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization

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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