Unexpected input to Create Channel Subscription endpoint causes DoS in Mattermost Confluence Plugin
Priority LOW 33CWE-1287Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.
Summary
Mattermost Confluence Plugin version <1.5.0 fails to handle unexpected request body which allows attackers to crash the plugin via constant hit to create channel subscription endpoint with an invalid request body.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00368 30th 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-3cg3-3mmr-w8hj |
- 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-3cg3-3mmr-w8hj
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mattermost:confluence:*:*:*:*:*:*:*:* | before 1.5.0 | Vulnerable | Mattermost |
- cpe:2.3:a:mattermost:confluence:*:*:*:*:*:*:*:* Versions before 1.5.0 Vulnerable ·Mattermost
Remediation
- Fix · CNA Mattermost Confluence Plugin (Mattermost) Fixed in 1.5.0
- Fix · GHSA-3cg3-3mmr-w8hj 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-2025-34260 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
- TI-2025-34275 Unauthenticated Channel Subscription Edit in Mattermost Confluence PluginPriority LOW 31
Timeline
- 2026-10-02 Threatist record created from CVE-2025-54525
- 2026-10-03 Alias added: GHSA-3cg3-3mmr-w8hj
References
More Mattermost Confluence vulnerabilities
- 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
- TI-2025-30953 Unauthorized Subscription Edit to Confluence Space in Mattermost Confluence Plugin CVSS 3.1MEDIUM 6.4
Sources
- CVE-2025-54525 · CVE Program
- CVE-2025-54525 · NVD
- FIRST EPSS
- GHSA-3cg3-3mmr-w8hj · GitHub Advisory Database · CC BY 4.0
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