CVE-2025-36530Network attack vector

Unauthorized plugin installation via import path traversal

Published Aug 21, 2025 · Updated Aug 21, 2025

Path traversal in affected Mattermost servers allows remote authenticated users to install unauthorized custom plugins through plugin import. The plugin import path handling fails to reject traversal elements or confine the selected file to its intended location, bypassing signature enforcement and marketplace restrictions. Restricted administrator access to plugin import is required; successful exploitation permits an unapproved plugin to be installed despite those controls.

CVSS severity6.8
Medium
EPSS probability0.49%
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 affected Mattermost servers allows remote authenticated users to install unauthorized custom plugins through plugin import. The plugin import path handling fails to reject traversal elements or confine the selected file to its intended location, bypassing signature enforcement and marketplace restrictions. Restricted administrator access to plugin import is required; successful exploitation permits an unapproved plugin to be installed despite those controls.

The record

CVE
CVE-2025-36530
Published
Aug 21, 2025
Updated
Aug 21, 2025
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-22
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Aug 21, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 21, 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=10.5.0 <=10.5.8
  2. Affected versionversion=10.8.0 <=10.8.3
  3. Affected versionversion=10.9.0 <=10.9.1
  4. Affected versionversion=9.11.0 <=9.11.17

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Mattermost · Mattermostversion=10.5.0 <=10.5.8; version=10.8.0 <=10.8.3; version=10.9.0 <=10.9.1; version=9.11.0 <=9.11.17

Published CVSS scores

6.8MattermostCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/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.

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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-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

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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