CVE-2025-9079Network attack vector

Admin RCE via unvalidated import directory

Published Sep 19, 2025 · Updated Sep 19, 2025

Path traversal in Mattermost allows remote authenticated users with administrator rights to execute arbitrary server code. The import directory path configuration is accepted without validation, allowing a crafted plugin upload to resolve into the prepackaged plugins directory and load as server code. Affected releases are 9.11.0 through 9.11.17, 10.5.0 through 10.5.8, 10.8.0 through 10.8.3, 10.9.0 through 10.9.3, and 10.10.0 through 10.10.1; administrator access and plugin upload capability are required.

CVSS severity8.0
High
EPSS probability0.64%
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 Mattermost allows remote authenticated users with administrator rights to execute arbitrary server code. The import directory path configuration is accepted without validation, allowing a crafted plugin upload to resolve into the prepackaged plugins directory and load as server code. Affected releases are 9.11.0 through 9.11.17, 10.5.0 through 10.5.8, 10.8.0 through 10.8.3, 10.9.0 through 10.9.3, and 10.10.0 through 10.10.1; administrator access and plugin upload capability are required.

The record

CVE
CVE-2025-9079
Published
Sep 19, 2025
Updated
Sep 19, 2025
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-22, T1505
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Sep 19, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 19, 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=10.10.0 <=10.10.1
  2. Affected versionversion=10.5.0 <=10.5.8
  3. Affected versionversion=10.8.0 <=10.8.3
  4. Affected versionversion=10.9.0 <=10.9.3
  5. Affected versionversion=9.11.0 <=9.11.17

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Mattermost · Mattermostversion=10.10.0 <=10.10.1; version=10.5.0 <=10.5.8; version=10.8.0 <=10.8.3; version=10.9.0 <=10.9.3; version=9.11.0 <=9.11.17

Published CVSS scores

8.0Mattermost, Inc.CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
7.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1505Server Software Component

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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