Security readout for executives and security teams
Plain-English summary
Mattermost Server versions before 3.1.0 had a browser-side security weakness related to missing noreferrer and noopener protections. The CVE describes this as allowing cross-site scripting. Business risk is mainly for organizations still running very old Mattermost deployments.
Executive priority
Treat this as a cleanup priority for legacy Mattermost systems, not as confirmed emergency exploitation. Any internet-accessible or business-critical instance below 3.1.0 should be upgraded promptly.
Technical view
The CVE states that Mattermost Server before 3.1.0 did not apply noreferrer and noopener protections. That can let linked content retain unsafe browser relationships with the originating page, and the CVE classifies the result as XSS. The source bundle does not provide CVSS, CWE, CPE, or exploit mechanics.
Likely exposure
Exposure appears limited to Mattermost Server deployments older than 3.1.0. The provided affected-product metadata is incomplete, so confirm by inventory and version evidence rather than CPE matching.
Exploitation context
The source bundle does not show CISA KEV listing or any cited evidence of active exploitation. No public exploit status is provided in the supplied sources.
Researcher notes
Evidence is sparse: CVE metadata names Mattermost Server before 3.1.0 and describes missing noreferrer/noopener protections causing XSS. No CVSS, CWE, affected CPEs, exploit evidence, or detailed vendor remediation text is included in the bundle.
Mitigation direction
- Identify any Mattermost Server instances running versions before 3.1.0.
- Upgrade affected Mattermost deployments to 3.1.0 or later, following vendor guidance.
- Prioritize migration to a currently supported Mattermost release where feasible.
- Review vendor security updates for any related hardening or upgrade notes.
Validation and detection
- Confirm Mattermost Server version from administrative inventory or deployment records.
- Verify no production instance remains below version 3.1.0.
- Check that security update tracking includes the Mattermost advisory source.
- Record compensating controls if immediate upgrade is not possible.
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-2016-11071 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.