Security readout for executives and security teams
Plain-English summary
CVE-2017-18870 is an access-control flaw in Mattermost Server. In versions before 4.5.0, 4.4.5, and 4.3.4, webhook access control could be mishandled when only admins were supposed to manage integrations. Public details are limited, so business urgency depends on whether affected Mattermost versions and that configuration are present.
Executive priority
Prioritize inventory and upgrade if Mattermost is business-critical or broadly used internally. Without CVSS or exploitation evidence, this is not source-supported as an emergency, but it affects administrative control over integrations.
Technical view
Mattermost Server before 4.5.0, 4.4.5, and 4.3.4 mishandled webhook access control in the EnableOnlyAdminIntegrations case. The record does not provide CVSS, CWE, exploit detail, or precise privilege requirements. Treat this as an integration authorization-control issue and validate version, configuration, and webhook activity.
Likely exposure
Exposure is most likely in Mattermost Server deployments older than 4.5.0, 4.4.5, or 4.3.4 where EnableOnlyAdminIntegrations was used to restrict integration management to administrators.
Exploitation context
The provided sources do not show CISA KEV listing, public exploitation, exploit availability, or weaponized use. The likely concern is unauthorized webhook or integration access despite an admin-only control setting, but impact detail is incomplete.
Researcher notes
The public record is sparse: no CVSS, CWE, patch notes, exploit status, or detailed attack path are provided in the bundle. Analysis should avoid assuming unauthenticated access, data theft, or remote code execution without additional vendor evidence.
Mitigation direction
- Upgrade Mattermost Server to 4.5.0, 4.4.5, 4.3.4, or later.
- Review Mattermost security updates for version-specific guidance.
- Inventory webhook integrations and their owners.
- Check whether EnableOnlyAdminIntegrations is enabled in affected deployments.
- Review recent webhook or integration changes for unexpected activity.
Validation and detection
- Confirm the deployed Mattermost Server version.
- Check whether the version is before 4.5.0, 4.4.5, or 4.3.4.
- Review configuration for EnableOnlyAdminIntegrations.
- Audit webhook and integration records for non-admin ownership or changes.
- Confirm upgrade status against Mattermost security update guidance.
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-2017-18870 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.