How severe is GHSA-9w4v-9c99-hv7r?

GHSA-9w4v-9c99-hv7r has a CVSS score of 6.5/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by GHSA-9w4v-9c99-hv7r?

GHSA-9w4v-9c99-hv7r affects the following packages: github.com/mattermost/mattermost-server (Go). Ecosystems affected: Go.

How do I fix GHSA-9w4v-9c99-hv7r?

Update github.com/mattermost/mattermost-server to 3.0.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-9w4v-9c99-hv7r is resolved across your whole dependency graph.

How do I detect GHSA-9w4v-9c99-hv7r 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. 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 GHSA-9w4v-9c99-hv7r 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 GHSA-9w4v-9c99-hv7r?

O3 pinpoints whether GHSA-9w4v-9c99-hv7r 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 GHSA-9w4v-9c99-hv7r actively exploited in the wild?

No public exploit code has been indexed for GHSA-9w4v-9c99-hv7r 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 GHSA-9w4v-9c99-hv7r?

GHSA-9w4v-9c99-hv7r is classified as Information Exposure (CWE-200). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was GHSA-9w4v-9c99-hv7r published, and has it been updated?

GHSA-9w4v-9c99-hv7r was published on May 24, 2022 and was last updated on November 5, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐹 Go

GHSA-9w4v-9c99-hv7r

MEDIUM

GHSA-9w4v-9c99-hv7r is a medium-severity (CVSS 6.5) Information Exposure vulnerability in github.com/mattermost/mattermost-server. O3 Security confirms whether GHSA-9w4v-9c99-hv7r is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

Mattermost Server exposes sensitive information via its System Console UI

Also known asCVE-2016-11078GO-2025-4057

Published

May 24, 2022

Updated

Nov 5, 2025

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Blast Radius

1 pkg affected

🐹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

An issue was discovered in Mattermost Server before 3.0.0. It potentially allows attackers to obtain sensitive information (credential fields within config.json) via the System Console UI.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐹Go	`github.com/mattermost/mattermost-server`	all versions	3.0.0

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. 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 to 3.0.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-9w4v-9c99-hv7r 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 GHSA-9w4v-9c99-hv7r 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 GHSA-9w4v-9c99-hv7r. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

An issue was discovered in Mattermost Server before 3.0.0. It potentially allows attackers to obtain sensitive information (credential fields within config.json) via the System Console UI.

O3 Security · Impact-Aware SCA

Is GHSA-9w4v-9c99-hv7r in your dependencies?

O3 detects GHSA-9w4v-9c99-hv7r 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