What’s Vulnerable › Vulnerabilities

CVE-2025-9084: Open redirect in OAuth login

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-15 · updated 2026-10-19
• Weakness: CWE-601

Description

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 products

• Mattermost: from 10.5.0 before 10.5.10 — fixed in 10.5.10

How to fix

Upgrade to a fixed version: Mattermost 10.5.10. Check the vendor advisory for mitigations.

References

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

Get alerted when CVE-2025-9084 or the next vulnerability affects your stack