Unauthenticated Channel Subscription Creation in Mattermost Confluence Plugin
Priority LOW 31CWE-306Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-306.
Summary
Mattermost Confluence Plugin version <1.5.0 fails to check the authorization of the user to the Mattermost instance which allows attackers to create a channel subscription without proper authorization via API call to the create channel subscription endpoint.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00223 13th percentileScored 2026-11-07
Fix Fixed Mattermost Confluence Plugin (Mattermost): 1.5.0github.com/mattermost/mattermost-plugin-confluence (Go): 1.5.0
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Mattermost | Mattermost Confluence Plugin | before 1.5.0 | 1.5.0 | Patch available | CNA |
| — | github.com/mattermost/mattermost-plugin-confluence (Go) | before 1.5.0 | 1.5.0 | Patch available | GHSA-6ff3-jgxh-vffj |
- Mattermost Confluence Plugin VendorMattermost Affected before 1.5.0 Fixed in 1.5.0 Patch available CNA
- github.com/mattermost/mattermost-plugin-confluence (Go) Vendor— Affected before 1.5.0 Fixed in 1.5.0 Patch available GHSA-6ff3-jgxh-vffj
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mattermost:confluence:*:*:*:*:*:mattermost:*:* | before 1.5.0 | Vulnerable | Mattermost |
- cpe:2.3:a:mattermost:confluence:*:*:*:*:*:mattermost:*:* Versions before 1.5.0 Vulnerable ·Mattermost
Remediation
- Fix · CNA Mattermost Confluence Plugin (Mattermost) Fixed in 1.5.0
- Fix · GHSA-6ff3-jgxh-vffj github.com/mattermost/mattermost-plugin-confluence (Go) Fixed in 1.5.0 Advisory →
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
Mattermost Confluence Plugin 1.5.0
13 records Highest priority Priority LOW 13 LOW
Other records, highest priority first
- TI-2025-34309 Unexpected input to Create Channel Subscription endpoint causes DoS in Mattermost Confluence PluginPriority LOW 33
- TI-2025-34260 Unexpected Input to Cloud Webhook endpoint Causes DoS in Mattermost Confluence PluginPriority LOW 33
- TI-2025-32962 Unexpected input to Update Channel Subscription endpoint causes DoS in Mattermost Confluence PluginPriority LOW 33
Timeline
- 2026-10-02 Threatist record created from CVE-2025-44004
- 2026-10-03 Alias added: GHSA-6ff3-jgxh-vffj
References
More Mattermost Confluence vulnerabilities
- TI-2025-34309 Unexpected input to Create Channel Subscription endpoint causes DoS in Mattermost Confluence Plugin CVSS 3.1HIGH 7.5
- TI-2025-34260 Unexpected Input to Cloud Webhook endpoint Causes DoS in Mattermost Confluence Plugin CVSS 3.1HIGH 7.5
- TI-2025-32962 Unexpected input to Update Channel Subscription endpoint causes DoS in Mattermost Confluence Plugin CVSS 3.1HIGH 7.5
- TI-2025-12355 Cross-Site Scripting (XSS) via Unescaped Display Names in Mattermost Confluence Plugin OAuth2 Flow CVSS 3.1HIGH 7.7
- TI-2025-34275 Unauthenticated Channel Subscription Edit in Mattermost Confluence Plugin CVSS 3.1HIGH 7.2
- TI-2025-30953 Unauthorized Subscription Edit to Confluence Space in Mattermost Confluence Plugin CVSS 3.1MEDIUM 6.4
Sources
- CVE-2025-44004 · CVE Program
- CVE-2025-44004 · NVD
- FIRST EPSS
- GHSA-6ff3-jgxh-vffj · GitHub Advisory Database · CC BY 4.0
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