How severe is CVE-2025-58075?

CVE-2025-58075 has a CVSS score of 8.1/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2025-58075?

CVE-2025-58075 affects the following packages: github.com/mattermost/mattermost/server/v8 (Go), github.com/mattermost/mattermost-server (Go), github.com/mattermost/mattermost-server (Go), github.com/mattermost/mattermost-server (Go). Ecosystems affected: Go.

How do I fix CVE-2025-58075?

Update github.com/mattermost/mattermost/server/v8 to 8.0.0-20250815100400-2d5cdc6e217e or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-58075 is resolved across your whole dependency graph.

How do I detect CVE-2025-58075 in my Go dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/mattermost/mattermost/server/v8. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

How do I mitigate CVE-2025-58075 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

How does O3 Security protect against CVE-2025-58075?

O3 pinpoints whether CVE-2025-58075 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Is CVE-2025-58075 actively exploited in the wild?

No public exploit code has been indexed for CVE-2025-58075 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What type of vulnerability is CVE-2025-58075?

CVE-2025-58075 is classified as CWE-862 (CWE-862). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2025-58075 published, and has it been updated?

CVE-2025-58075 was published on October 16, 2025 and was last updated on July 31, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐹 Go

CVE-2025-58075

HIGH

CVE-2025-58075 is a high-severity (CVSS 8.1) CWE-862 vulnerability in github.com/mattermost/mattermost/server/v8. O3 Security confirms whether CVE-2025-58075 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

Arbitrary Mattermost Team can be joined by manipulating the SAML RelayState

Also known asGHSA-r6qj-894f-5hr2GO-2025-4035

Published

Oct 16, 2025

Updated

Jul 31, 2026

Affected

4 pkgs

Patched

4 / 4

Exploits

None indexed

Blast Radius

4 pkgs affected

🐹github.com/mattermost/mattermost/server/v8🐹github.com/mattermost/mattermost-server🐹github.com/mattermost/mattermost-server🐹github.com/mattermost/mattermost-server

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

Mattermost versions 10.11.x <= 10.11.1, 10.10.x <= 10.10.2, 10.5.x <= 10.5.10 fail to verify a user has permission to join a Mattermost team using the original invite token which allows any attacked to join any team on a Mattermost server regardless of restrictions via manipulating the RelayState

Affected Packages

4 total 4 fixed

Ecosystem	Package	Vulnerable range	Fix
🐹Go	`github.com/mattermost/mattermost/server/v8`	all versions	8.0.0-20250815100400-2d5cdc6e217e
🐹Go	`github.com/mattermost/mattermost-server`	≥ 10.11.0&&< 10.11.2	10.11.2
🐹Go	`github.com/mattermost/mattermost-server`	≥ 10.10.0&&< 10.10.3	10.10.3
🐹Go	`github.com/mattermost/mattermost-server`	≥ 10.5.0&&< 10.5.11	10.5.11

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/mattermost/mattermost/server/v8. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update github.com/mattermost/mattermost/server/v8 to 8.0.0-20250815100400-2d5cdc6e217e or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-58075 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether CVE-2025-58075 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to CVE-2025-58075. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2025-58075 in your dependencies?

O3 detects CVE-2025-58075 across Go dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my dependencies How O3 SCA works