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

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

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N`)
- **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 available:** No
- **Published:** 13 Nov 2025
- **Updated:** 13 Nov 2025
- **Also known as:** GHSA-h2fg-6x82-5f24

## 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 (Cross-Site Request Forgery)

## Which versions are affected by CVE-2025-59480?

It affects 1 product.


Products: 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.

## Other vulnerabilities in Mattermost

- [CVE-2019-20848](https://insights.sbomify.com/CVE-2019-20848/): Other in n/a (high 7.5)
- [CVE-2019-20852](https://insights.sbomify.com/CVE-2019-20852/): Information disclosure in n/a (high 7.5)
- [CVE-2020-14449](https://insights.sbomify.com/CVE-2020-14449/): Information disclosure in n/a (high 7.5)
- [CVE-2020-14451](https://insights.sbomify.com/CVE-2020-14451/): Information disclosure in n/a (high 7.5)
- [CVE-2025-1558](https://insights.sbomify.com/CVE-2025-1558/): Denial of Service Via Malicious GIF (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-59480 and fix it if it is affected.

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

Affected product: Mattermost. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-59480/ (Markdown: https://insights.sbomify.com/CVE-2025-59480/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-59480
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-59480
- OSV: https://osv.dev/vulnerability/CVE-2025-59480

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-59480/
Summaries are generated and may contain mistakes; the official description above is the record.