CVE-2026-4858

CRITICAL EPSS 16.1%
Published May 21, 20261mo ago · Modified Jun 17, 20261w ago
9.9 CVSS 3.1
Critical
Find Similar
Published May 21, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago

Description

Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to check integration URL for path traversal which allows an malicious authenticated user to call an arbitrary API via system admin Mattermost auth token using via path traversal in integration action URL.. Mattermost Advisory ID: MMSA-2026-00640

CVSS Details

Base Score
9.9
Exploitability
3.1
Impact
6.0
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Changed
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
16.1% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-22 Path Traversal Resource Mgmt

Affected Products 4

VendorProductVersionRange
mattermostmattermost_server*≥10.11.0  –  <10.11.15
mattermostmattermost_server*≥11.4.0  –  <11.4.5
mattermostmattermost_server*≥11.5.0  –  <11.5.4
mattermostmattermost_server11.6.0any

References 1

  • mattermost.com https://mattermost.com/security-updates
    Vendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.