CVE-2023-6458Network attack vector

Client-side path traversal via unvalidated route parameters

Published Dec 6, 2023 · Updated Aug 2, 2024

Client-side path traversal in Mattermost 7.8.13, 8.1.4, 9.0.2, and 9.1.1 allows remote authenticated users to alter webapp routing. The webapp accepts unvalidated team and channel route parameters, so crafted path components escape the intended /<TEAM_NAME>/channels/<CHANNEL_NAME> route. A low-privileged account and user interaction are required; the public advisory does not identify the exact destinations or resources reachable after traversal.

CVSS severity7.1
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

Client-side path traversal in Mattermost 7.8.13, 8.1.4, 9.0.2, and 9.1.1 allows remote authenticated users to alter webapp routing. The webapp accepts unvalidated team and channel route parameters, so crafted path components escape the intended /<TEAM_NAME>/channels/<CHANNEL_NAME> route. A low-privileged account and user interaction are required; the public advisory does not identify the exact destinations or resources reachable after traversal.

The record

CVE
CVE-2023-6458
Published
Dec 6, 2023
Updated
Aug 2, 2024
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-74, CWE-22
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 6, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record 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=0 <=7.8.13
  2. Affected versionversion=0 <=8.1.4
  3. Affected versionversion=0 <=9.0.2
  4. Affected versionversion=0 <=9.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mattermost · Mattermostversion=0 <=7.8.13; version=0 <=8.1.4; version=0 <=9.0.2; version=0 <=9.1.1

Published CVSS scores

7.1Mattermost, Inc.CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:H/A:L
9.8NISTCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

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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