CVE-2025-9084: Open redirect in OAuth login

Published Sep 15, 2025
·
Updated

Mattermost versions 10.5.x <= 10.5.9 fail to properly validate redirect URLs which allows attackers to redirect users to malicious sites via crafted OAuth login URLs

Affected Software

4 affected componentsFixes available
Mattermost Mattermost<=10.5.9
Mattermost Mattermost Server>=10.5.0<10.5.10
go/github.com/mattermost/mattermost-server>=10.5.0<10.5.10
10.5.10
go/github.com/mattermost/mattermost/server/v8<8.0.0-202508080704-39bd251fe4f600
8.0.0-202508080704-39bd251fe4f600

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade go/github.com/mattermost/mattermost-server to a version that resolves this vulnerability.

    Fixed in 10.5.10
  2. Upgrade

    Upgrade go/github.com/mattermost/mattermost/server/v8 to a version that resolves this vulnerability.

    Fixed in 8.0.0-202508080704-39bd251fe4f600
  3. Upgrade

    Upgrade Mattermost to a version that resolves this vulnerability.

    Fixed in 10.11.0
  4. Upgrade

    Upgrade Mattermost to a version that resolves this vulnerability.

    Fixed in 10.5.10

Event History

Sep 15, 2025
CVE Published
via MITRE·10:22 AM
Data Sourced
via MITRE·10:22 AM
RemedyDescriptionSeverityWeakness
Data Sourced
via NVD·11:15 AM
DescriptionSeverityWeaknessAffected Software
Advisory Published
via GitHub·12:31 PM
Data Sourced
via GitHub·12:31 PM
DescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

1

What is the severity of CVE-2025-9084?

CVE-2025-9084 is considered a high severity vulnerability due to its potential to redirect users to malicious sites.

2

How do I fix CVE-2025-9084?

To fix CVE-2025-9084, upgrade Mattermost to version 10.5.10 or later where the validation of redirect URLs is properly implemented.

3

Who is affected by CVE-2025-9084?

CVE-2025-9084 affects Mattermost versions 10.5.x up to and including 10.5.9.

4

What type of attack does CVE-2025-9084 enable?

CVE-2025-9084 allows attackers to execute open redirect attacks via crafted OAuth login URLs.

5

Can CVE-2025-9084 lead to data exposure?

Yes, CVE-2025-9084 can potentially lead to data exposure if users are redirected to malicious sites designed to steal their information.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203