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CVE-2025-9084

Good to know:

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Date: September 15, 2025

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

Severity Score

Related Resources (6)

https://github.com/advisories/GHSA-hm95-jx66-g2gh
https://nvd.nist.gov/vuln/detail/CVE-2025-9084
https://github.com/mattermost/mattermost
https://github.com/mattermost/mattermost/commit/39bd251fe4f66b7e847fc6d653221886347ff160
https://mattermost.com/security-updates
https://www.mend.io/vulnerability-database/CVE-2025-9084

Severity Score

Weakness Type (CWE)

URL Redirection to Untrusted Site ('Open Redirect')

CWE-601

Top Fix

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Upgrade Version

Upgrade to version github.com/mattermost/mattermost - v10.5.10;github.com/mattermost/mattermost-server - v10.5.10

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): LOW
Availability (A): NONE

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