CVE-2023-6458

Name: CVE-2023-6458
Creator: NVD / NIST
Published: 2023-12-06T09:15:08.907+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.64%

Last modified Jun 17, 2026

CVE-2023-6458 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Mattermost webapp fails to validate route parameters in/<TEAM_NAME>/channels/<CHANNEL_NAME> allowing an attacker to perform a client-side path traversal. . EPSS estimates a 0.64% chance of exploitation in the next 30 days.

Description

Mattermost webapp fails to validate route parameters in/<TEAM_NAME>/channels/<CHANNEL_NAME> allowing an attacker to perform a client-side path traversal.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.64%

46.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Mattermost	Mattermost Server	< 7.8.14
Mattermost	Mattermost Server	>= 8.0.0, < 8.1.5
Mattermost	Mattermost Server	>= 9.0.0, < 9.0.3
Mattermost	Mattermost Server	>= 9.1.0, < 9.1.2

References

https://mattermost.com/security-updatesVendor Advisory
https://mattermost.com/security-updatesVendor Advisory

Timeline

Published: Dec 6, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-6458?

Mattermost webapp fails to validate route parameters in/<TEAM_NAME>/channels/<CHANNEL_NAME> allowing an attacker to perform a client-side path traversal.

How severe is CVE-2023-6458?

CVE-2023-6458 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.64% probability of exploitation in the next 30 days.

How do I fix CVE-2023-6458?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-6458?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST