CVE-2025-41443Network attack vector

Guest channel metadata disclosure via missing authorization

Published Oct 16, 2025 · Updated Oct 16, 2025

Missing authorization in Mattermost 10.5.0 through 10.5.12 and 10.11.0 through 10.11.2 allows remote authenticated users to read channel metadata. The getPublicChannelsByIdsForTeam handler returns requested public-channel objects without checking whether a guest session has PermissionReadChannel for each channel. A guest account and valid team and channel identifiers are required; exposure is limited to active public-channel names and metadata.

CVSS severity4.3
Medium
EPSS probability0.30%
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 10.5.0 through 10.5.12 and 10.11.0 through 10.11.2 allows remote authenticated users to read channel metadata. The getPublicChannelsByIdsForTeam handler returns requested public-channel objects without checking whether a guest session has PermissionReadChannel for each channel. A guest account and valid team and channel identifiers are required; exposure is limited to active public-channel names and metadata.

The record

CVE
CVE-2025-41443
Published
Oct 16, 2025
Updated
Oct 16, 2025
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-862, T1213.005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 16, 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=10.11.0 <=10.11.2
  2. Affected versionversion=10.5.0 <=10.5.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mattermost · Mattermostversion=10.11.0 <=10.11.2; version=10.5.0 <=10.5.10

Published CVSS scores

4.3Mattermost, Inc.CVSS: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1213.005Data from Information Repositories: Messaging Applications

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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