# Mattermost GitHub Plugin for Mattermost vulnerabilities

Source: https://junglewise.ai/threats/technologies/github-plugin  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 12 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/github-plugin.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 3 vulnerabilities in Mattermost GitHub Plugin for Mattermost: 0 in the last 7 days and 0 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-28735, was published on 22 May 2026.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 0
- All time: 3 (0 critical, 0 exploited in the wild)

## About Mattermost GitHub Plugin for Mattermost

The GitHub plugin for Mattermost allows users to receive notifications and manage GitHub repositories directly from the Mattermost interface.

## Latest Mattermost GitHub Plugin for Mattermost vulnerabilities

- [CVE-2026-28735: Mattermost incorrect OAuth token scope validation in GitHub integration](https://junglewise.ai/threats/cve-2026-28735-mattermost-incorrect-oauth-token-scope-validation-in-github) (medium, CVSS 5.4, published 22 May 2026)
- [CVE-2026-5308: Mattermost denial of service in plugin HTTP endpoints](https://junglewise.ai/threats/cve-2026-5308-mattermost-denial-of-service-in-plugin-http-endpoints) (high, CVSS 7.5, published 22 May 2026)
- [CVE-2026-4646: Mattermost Server denial of service in PR details endpoint](https://junglewise.ai/threats/cve-2026-4646-mattermost-server-denial-of-service-in-pr-details-endpoint) (medium, CVSS 4.3, published 22 May 2026)

## Most severe Mattermost GitHub Plugin for Mattermost vulnerabilities

- [CVE-2026-5308: Mattermost denial of service in plugin HTTP endpoints](https://junglewise.ai/threats/cve-2026-5308-mattermost-denial-of-service-in-plugin-http-endpoints) (high, CVSS 7.5, published 22 May 2026)
- [CVE-2026-28735: Mattermost incorrect OAuth token scope validation in GitHub integration](https://junglewise.ai/threats/cve-2026-28735-mattermost-incorrect-oauth-token-scope-validation-in-github) (medium, CVSS 5.4, published 22 May 2026)
- [CVE-2026-4646: Mattermost Server denial of service in PR details endpoint](https://junglewise.ai/threats/cve-2026-4646-mattermost-server-denial-of-service-in-pr-details-endpoint) (medium, CVSS 4.3, published 22 May 2026)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Other Mattermost technologies

- [Mattermost Server](https://junglewise.ai/threats/technologies/server-public): 111 vulnerabilities
- [Mattermost Desktop App](https://junglewise.ai/threats/technologies/desktop-app): 14 vulnerabilities
- [Mattermost](https://junglewise.ai/threats/technologies/mattermost): 9 vulnerabilities
- [Mattermost Plugins](https://junglewise.ai/threats/technologies/mattermost-plugins): 5 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Mattermost GitHub Plugin for Mattermost vulnerabilities", https://junglewise.ai/threats/technologies/github-plugin, 12 November 2026.