CVE-2025-59480 Inadequate validation of SSO redirect credentials permits credential theft

Q: Is CVE-2025-59480 being exploited?

There is no known exploitation of CVE-2025-59480 in the wild and no public exploit code.

Q: How do I fix CVE-2025-59480?

No fix has been published for CVE-2025-59480 yet. Limit exposure of the affected software until one is available.

Medium 6.1 Published 13 Nov 2025 Updated 13 Nov 2025

Attackers can steal user session credentials by exploiting inadequate validation of SSO redirect tokens in the Mattermost mobile application.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2025-59480?

CVE-2025-59480 is a medium-severity vulnerability in Mattermost, published on 13 Nov 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Mattermost Mobile Apps versions <=2.32.0 fail to verify that SSO redirect tokens originate from the trusted server, which allows a malicious Mattermost instance or on-path attacker to obtain user session credentials via crafted token-in-URL responses

Weakness: CWE-352

Which versions are affected by CVE-2025-59480?

It affects 1 product.

Products include Mattermost Mattermost Mobile.

How do I fix CVE-2025-59480?

No fix has been published for CVE-2025-59480 yet. Limit exposure of the affected software until one is available.

Is CVE-2025-59480 being exploited?

There is no known exploitation of CVE-2025-59480 in the wild and no public exploit code.

Sources

Also known as GHSA-h2fg-6x82-5f24.