Security readout for executives and security teams
Plain-English summary
Older Mattermost Server releases had an access-control flaw where an API endpoint did not properly enforce an integration permission restriction. In practical terms, a setting intended to limit integration use might not be reliable on affected versions.
Executive priority
Prioritize this if legacy Mattermost 3.6.x, 3.7.x, or 3.8.x servers remain in use. The business risk is permission enforcement failure in a collaboration platform, but severity and exploitation evidence are incomplete.
Technical view
CVE-2017-18916 affects Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. The described issue is an API endpoint authorization weakness: endpoint access control does not honor an integration permission restriction. No CVSS, CWE, or detailed affected CPE data is provided.
Likely exposure
Exposure is limited to organizations still running Mattermost Server versions earlier than 3.8.2, 3.7.5, or 3.6.7. The bundle does not identify affected editions, configurations, or internet-exposure requirements.
Exploitation context
The provided bundle does not show CISA KEV listing, active exploitation, exploit availability, or technical attack details. Treat exploitation status as unconfirmed from the available evidence.
Researcher notes
The public record is sparse. Analysis should focus on version confirmation, permission model behavior around integrations, and vendor advisory details. Avoid assuming broader privilege escalation or remote unauthenticated impact without additional evidence.
Mitigation direction
- Upgrade Mattermost Server to 3.8.2, 3.7.5, 3.6.7, or later supported releases.
- Review Mattermost security updates for vendor-specific remediation guidance.
- Audit integration permission settings on any legacy Mattermost deployment.
- Restrict access to Mattermost administrative and integration-management interfaces.
Validation and detection
- Inventory Mattermost Server versions across production, staging, and backup environments.
- Confirm no running instance is older than 3.8.2, 3.7.5, or 3.6.7.
- Review audit logs for unexpected integration-related API activity.
- Verify integration permission settings after upgrade or decommissioning.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2017-18916 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://mattermost.com/security-updates/CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.