Security readout for executives and security teams
Plain-English summary
Mattermost Server versions before 3.0.0 exposed sensitive information about team URLs through an API. The public record does not provide a CVSS score, CWE, or detailed impact. Treat this mainly as a legacy Mattermost exposure issue, especially if old instances are internet-facing.
Executive priority
Prioritize discovery over emergency response. This becomes business-relevant if a legacy Mattermost instance remains exposed, because team URL information may aid reconnaissance or privacy-sensitive mapping of internal collaboration spaces.
Technical view
CVE-2016-11075 is an information disclosure issue in Mattermost Server before 3.0.0. The stated exposure is sensitive team URL information obtainable via an API. The source bundle does not describe authentication requirements, affected endpoints, exploit prerequisites, or a vendor-specific remediation beyond the pre-3.0.0 version boundary.
Likely exposure
Organizations are likely exposed only if they still run Mattermost Server earlier than 3.0.0, including forgotten test, legacy, or externally reachable deployments. The bundle lists no affected CPEs or detailed product matrix.
Exploitation context
The source bundle marks KEV as false and provides no cited evidence of active exploitation. The described abuse is information disclosure through an API, but the public evidence here is too limited to assess exploitability or attacker effort.
Researcher notes
Evidence is sparse: no CVSS, CWE, affected CPEs, endpoint details, authentication context, or exploit discussion are provided. Analysis should stay constrained to Mattermost Server before 3.0.0 and API-based disclosure of team URL information.
Mitigation direction
- Inventory Mattermost Server deployments and flag any version earlier than 3.0.0.
- Move affected deployments off pre-3.0.0 versions, subject to Mattermost vendor guidance.
- Restrict external access to legacy Mattermost APIs until remediation is confirmed.
- Review Mattermost security updates for any environment-specific instructions.
Validation and detection
- Confirm the running Mattermost Server version on every production and non-production instance.
- Check whether any pre-3.0.0 instance is reachable from untrusted networks.
- Review access logs for unusual API access patterns against legacy Mattermost systems.
- Document remediation status for each identified Mattermost deployment.
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
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CVE-2016-11075 mapping review
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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.