CVE-2024-40886Network attack vector

Unauthorized user-management actions via unsanitized redirection

Published Aug 22, 2024 · Updated Aug 22, 2024

Cross-site request forgery in affected Mattermost releases allows remote authenticated users to trigger actions on the User Management page. The frontend uses unsanitized user-controlled redirection input, permitting client-side path traversal that causes an administrator's browser to submit a forged request. Exploitation requires low-privileged access and a system administrator to click a crafted link; the disclosed consequence is unauthorized user-management activity.

CVSS severity4.6
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Cross-site request forgery in affected Mattermost releases allows remote authenticated users to trigger actions on the User Management page. The frontend uses unsanitized user-controlled redirection input, permitting client-side path traversal that causes an administrator's browser to submit a forged request. Exploitation requires low-privileged access and a system administrator to click a crafted link; the disclosed consequence is unauthorized user-management activity.

The record

CVE
CVE-2024-40886
Published
Aug 22, 2024
Updated
Aug 22, 2024
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-352, T1204.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 22, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 22, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=9.10.0
  2. Affected versionversion=9.5.0 <=9.5.7
  3. Affected versionversion=9.8.0 <=9.8.2
  4. Affected versionversion=9.9.0 <=9.9.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mattermost · Mattermostversion=9.10.0; version=9.5.0 <=9.5.7; version=9.8.0 <=9.8.2; version=9.9.0 <=9.9.1

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
5.1GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
4.6Mattermost, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
T1204.001User Execution: Malicious Link

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo