Technology · Go
github.com/mattermost/mattermost-server (Go) vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 297 vulnerabilities in github.com/mattermost/mattermost-server (Go): 0 in the last 7 days and 0 in the last 90 days, 2 of them critical and 0 exploited in the wild. The most recent, CVE-2026-3114, was published on 25 June 2026.
- Last 7 days
- 0
- Last 90 days
- 0
- Critical, all time
- 2
- Exploited in the wild
- 0
About github.com/mattermost/mattermost-server (Go)
Mattermost is an open-source team collaboration platform with messaging and integrations.
Latest github.com/mattermost/mattermost-server (Go) vulnerabilities
- CVE-2026-3114: Mattermost doesn't validate decompressed archive entry sizes during file extractionlowCVSS 3.1EPSS 0.4%
- CVE-2026-3115: Mattermost allows authenticated guest users to enumerate user IDs outside their allowed visibility scopelowCVSS 3.1EPSS 0.3%
- CVE-2026-27659: GO-2026-5629 - Mattermost doesn't properly validate CSRF tokens in github.com/mattermost/mattermost-serverlowCVSS 3.1EPSS 0.2%
- CVE-2026-28741: GO-2026-5495 - Mattermost doesn't validate CSRF tokens on an authentication endpoint in…lowCVSS 3.1EPSS 0.2%
- CVE-2026-4274: GO-2026-5393 - Mattermost has an Incorrect Authorization issue in github.com/mattermost/mattermost-serverlowCVSS 3.1EPSS 0.2%
- CVE-2026-27656: Mattermost allows attackers to take over arbitrary user accounts via overly permissive substring matching flawlowCVSS 3.1EPSS 0.3%
- CVE-2026-20719: Mattermost: Authenticated DoS through failure to prevent rendering of external SVGs on link embedslowCVSS 3.1EPSS 0.4%
- CVE-2026-3112: Mattermost allows system administrators to read arbitrary host files via malicious AdvancedLoggingJSON configurationlowCVSS 3.1EPSS 0.5%
- CVE-2026-3108: Mattermost allows attackers to manipulate administrator terminals via crafted messages containing ANSI and OSC escape…lowCVSS 3.1EPSS 0.3%
- CVE-2026-3113: GO-2026-5112 - Mattermost doesn't set permissions on downloaded bulk export in github.com/mattermost/mattermost-serverlowCVSS 3.1EPSS 0.1%
- CVE-2026-8823: Mattermost incorrect authorization in demote-user APIlowCVSS 3.8EPSS 0.3%
- CVE-2026-9162: Mattermost insufficient session expiration in WebSocket connectionsmediumCVSS 4.3EPSS 0.3%
- CVE-2026-8074: Mattermost incorrect authorization in user active status endpointlowCVSS 3.8EPSS 0.3%
- CVE-2026-6673: Mattermost authentication bypass in Atlassian Connect callbackmediumCVSS 6.4EPSS 0.3%
- CVE-2026-6062: Mattermost Server authorization bypass in subscription edit endpointmediumCVSS 6.4EPSS 0.2%
- CVE-2026-5139: Mattermost missing authorization in GitLab connect commandmediumCVSS 5.4EPSS 0.3%
- CVE-2026-7387: Mattermost privilege escalation in group syncable link and patch endpointshighCVSS 8.8EPSS 0.4%
- CVE-2026-7184: Mattermost sensitive information disclosure in Remote Cluster APImediumCVSS 6.5EPSS 0.4%
- CVE-2026-6961: Mattermost path traversal in shared channel file synchighCVSS 7.6EPSS 0.4%
- CVE-2026-6739: Mattermost privilege escalation in role patch APImediumCVSS 6.7EPSS 0.5%
- CVE-2026-6689: Mattermost missing authorization for invite settings during team creationmediumCVSS 4.3EPSS 0.3%
- CVE-2026-6046: Mattermost message interception via predictable bot usernamesmediumCVSS 5.3EPSS 0.3%
- CVE-2026-3433: Mattermost information disclosure in role_updated WebSocket eventsmediumCVSS 4.3EPSS 0.3%
- CVE-2026-4915: Mattermost Server denial of service via null webhook attachmentmediumCVSS 6.5EPSS 0.4%
- CVE-2026-28735: Mattermost incorrect OAuth token scope validation in GitHub integrationmediumCVSS 5.4EPSS 0.2%
Most severe github.com/mattermost/mattermost-server (Go) vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2025-12421: GO-2025-4170 - Mattermost fails to to verify the token used during code exchange in github.com/mattermost/mattermost-servercriticalCVSS 9.9EPSS 0.4%
- CVE-2025-12419: Mattermost fails to properly validate OAuth state tokens during OpenID Connect authenticationcriticalCVSS 9.9EPSS 0.4%
- CVE-2026-7387: Mattermost privilege escalation in group syncable link and patch endpointshighCVSS 8.8EPSS 0.4%
- CVE-2026-6346: Mattermost sensitive information disclosure in support packet generationhighCVSS 8.7EPSS 0.4%
- CVE-2026-4858: Mattermost path traversal in integration action URLhighCVSS 8EPSS 0.4%
- CVE-2026-6961: Mattermost path traversal in shared channel file synchighCVSS 7.6EPSS 0.4%
- CVE-2026-6347: Mattermost Calls plugin information disclosure in support packetshighCVSS 7.6EPSS 0.4%
- CVE-2026-5740: Mattermost Server denial of service via msgpack WebSocket frameshighCVSS 7.5EPSS 0.6%
- CVE-2026-5308: Mattermost denial of service in plugin HTTP endpointshighCVSS 7.5EPSS 0.4%
- CVE-2025-14273: Mattermost with Jira plugin enabled has Incorrect Implementation of Authentication AlgorithmhighCVSS 7.2EPSS 0.3%
Vulnerabilities per week
Nothing was published in the last eight weeks. The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 17 Aug 2026 | 0 | 0 | |
| 24 Aug 2026 | 0 | 0 | |
| 31 Aug 2026 | 0 | 0 | |
| 7 Sep 2026 | 0 | 0 | |
| 14 Sep 2026 | 0 | 0 | |
| 21 Sep 2026 | 0 | 0 | |
| 28 Sep 2026 | 0 | 0 | |
| 5 Oct 2026 | 0 | 0 | |
| 12 Oct 2026 | 0 | 0 | |
| 19 Oct 2026 | 0 | 0 | |
| 26 Oct 2026 | 0 | 0 | |
| 2 Nov 2026 | 0 | 0 | |
| 9 Nov 2026 | 0 | 0 |
Embed a badge
A live badge for a README, a status page or an internal wiki: how many github.com/mattermost/mattermost-server (Go) vulnerabilities were published in the last 7 days and how many of them are critical, refreshed hourly.
[](https://junglewise.ai/threats/technologies/github-com-mattermost-mattermost-server)<a href="https://junglewise.ai/threats/technologies/github-com-mattermost-mattermost-server"><img src="https://junglewise.ai/threats/technologies/github-com-mattermost-mattermost-server/badge.svg" alt="github.com/mattermost/mattermost-server (Go) vulnerabilities" /></a>How this is built
Junglewise Threat Intelligence collects vulnerabilities from NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories, and matches each one to the technologies and vendors it affects. Dates are the date a vulnerability was published, in UTC.
The pages are rebuilt from the database every hour. Frozen weekly and monthly reports never change once published, so they can be cited.
Use this data
The same data is at https://junglewise.ai/threats/technologies/github-com-mattermost-mattermost-server.json, and this page as text at https://junglewise.ai/threats/technologies/github-com-mattermost-mattermost-server.md, for scripts and language models. It is free to reuse under CC BY 4.0 with a link back to this page.
Cite as: Junglewise Threat Intelligence, "github.com/mattermost/mattermost-server (Go) vulnerabilities", https://junglewise.ai/threats/technologies/github-com-mattermost-mattermost-server, 13 November 2026.