CVE-2025-25279Public exploitNetwork attack vector

Arbitrary file read via unvalidated board attachment paths

Published Feb 24, 2025 · Updated Feb 24, 2025

Path traversal in vulnerable Mattermost Boards releases allows remote authenticated users to read arbitrary server files through board import and export. During board import, block validation accepts an attachment fileId containing traversal sequences; export then resolves that value as a filesystem path and returns the referenced file. The flaw requires authenticated Boards access and affects 10.2.0 through 10.2.2, 10.3.0 through 10.3.2, 10.4.0 through 10.4.1, and 9.11.0 through 9.11.7.

CVSS severity9.9
Critical
EPSS probability24.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in vulnerable Mattermost Boards releases allows remote authenticated users to read arbitrary server files through board import and export. During board import, block validation accepts an attachment fileId containing traversal sequences; export then resolves that value as a filesystem path and returns the referenced file. The flaw requires authenticated Boards access and affects 10.2.0 through 10.2.2, 10.3.0 through 10.3.2, 10.4.0 through 10.4.1, and 9.11.0 through 9.11.7.

The record

CVE
CVE-2025-25279
Published
Feb 24, 2025
Updated
Feb 24, 2025
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-22, T1005
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

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

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mattermost · Mattermostversion=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

9.9Mattermost, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

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-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1005Data from Local System

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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