NIST deprecates RSA-2048 from 2030. Find every one of them before attackers do.
🐹
🐹 Go
Not in CISA KEV
MEDIUM severity

Mattermost has a Missing Authorization vulnerabilityGHSA-3q4q-wqm6-hvf3

MEDIUMFix: mattermost/mattermost@01b9539

GHSA-3q4q-wqm6-hvf3 is a medium-severity (CVSS 5.4) CWE-862 vulnerability in github.com/mattermost/mattermost/server/v8. A fix is available for github.com/mattermost/mattermost/server/v8 — see the affected versions and patch details below.

Also known asCVE-2025-41410GO-2025-4029
Published
Updated
Affected
4 pkgs
Patched
4 / 4
Exploits
None indexed
Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-3q4q-wqm6-hvf3.

EPSS Exploitation Probability

via FIRST.org ↗
0.3%probability of exploitation in next 30 days
Lower Risk+0.01%
Lower risk than most CVEs24th percentile — riskier than 24% of all scored CVEsHighest risk
0.00%0.27%0.54%0.81%0.0%0.3%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

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 10.10.x <= 10.10.2, 10.5.x <= 10.5.10, 10.11.x <= 10.11.2 fail to validate email ownership during Slack import process which allows attackers to create verified user accounts with arbitrary email domains via malicious Slack import data to bypass email-based team access restrictions.

Affected Packages

4 total 4 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/mattermost/mattermost/server/v8all versions8.0.0-20250822083415-01b95392a450go get github.com/mattermost/mattermost/server/v8@v8.0.0-20250822083415-01b95392a450
🐹Gogithub.com/mattermost/mattermost-server≥ 10.10.0&&< 10.10.310.10.3go get github.com/mattermost/mattermost-server@v10.10.3
🐹Gogithub.com/mattermost/mattermost-server≥ 10.5.0&&< 10.5.1110.5.11go get github.com/mattermost/mattermost-server@v10.5.11
🐹Gogithub.com/mattermost/mattermost-server≥ 10.11.0&&< 10.11.310.11.3go get github.com/mattermost/mattermost-server@v10.11.3

Affected Products

1 product · 3 configurations
Application
mattermost servermattermost
≥ 10.11.0 && < 10.11.3
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/mattermost/mattermost/server/v8, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update github.com/mattermost/mattermost/server/v8 to 8.0.0-20250822083415-01b95392a450 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-3q4q-wqm6-hvf3 is resolved across your whole dependency graph.

  3. Workarounds

    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Frequently Asked Questions

Mattermost versions 10.10.x <= 10.10.2, 10.5.x <= 10.5.10, 10.11.x <= 10.11.2 fail to validate email ownership during Slack import process which allows attackers to create verified user accounts with arbitrary email domains via malicious Slack import data to bypass email-based team access restrictions.
O3 Security · Impact-Aware SCA

Is GHSA-3q4q-wqm6-hvf3 in your dependencies?

Find it across Go, including transitive dependencies.

Scan my dependencies How O3 SCA works
Mattermost has a Missing Authorization vulnerability