CVE-2025-24526Public exploitNetwork attack vector

Archived-channel disclosure via unchecked export authorization

Published Feb 24, 2025 · Updated Feb 24, 2025

Incorrect authorization in affected Mattermost releases allows remote authenticated users to export archived-channel contents. The channel-export plugin endpoint accepts an archived channel ID and returns its CSV content without enforcing the disabled archived-channel viewing setting. Exploitation requires channel membership, an archived channel, the enabled export plugin, and the archived-channel viewing setting to be disabled; the consequence is disclosure of that channel's messages.

CVSS severity4.3
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in affected Mattermost releases allows remote authenticated users to export archived-channel contents. The channel-export plugin endpoint accepts an archived channel ID and returns its CSV content without enforcing the disabled archived-channel viewing setting. Exploitation requires channel membership, an archived channel, the enabled export plugin, and the archived-channel viewing setting to be disabled; the consequence is disclosure of that channel's messages.

The record

CVE
CVE-2025-24526
Published
Feb 24, 2025
Updated
Feb 24, 2025
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-863, T1213.005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 24, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.1.0 <=10.1.3
  2. Affected versionversion=10.2.0 <=10.2.2
  3. Affected versionversion=10.3.0 <=10.3.2
  4. Affected versionversion=10.4.0 <=10.4.1
  5. Affected versionversion=9.11.0 <=9.11.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mattermost · Mattermostversion=10.1.0 <=10.1.3; version=10.2.0 <=10.2.2; version=10.3.0 <=10.3.2; version=10.4.0 <=10.4.1; version=9.11.0 <=9.11.7

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 exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1213.005Messaging Applications

Public exploit references

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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