Unauthorized Channel Subscription Edit in Mattermost Confluence Plugin
Priority LOW 18CWE-862Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-862.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00216 12th 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-v6c8-g53h-mc2h |
- 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-v6c8-g53h-mc2h
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-v6c8-g53h-mc2h 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-2025-53910
- 2026-10-03 Alias added: GHSA-v6c8-g53h-mc2h
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-2025-28553 Unauthenticated Channel Subscription Creation in Mattermost Confluence Plugin CVSS 3.1HIGH 7.2
Sources
- CVE-2025-53910 · CVE Program
- CVE-2025-53910 · NVD
- FIRST EPSS
- GHSA-v6c8-g53h-mc2h · GitHub Advisory Database · CC BY 4.0
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