Security readout for executives and security teams
Plain-English summary
CVE-2016-11070 is a cross-site scripting issue in Mattermost Server before 3.1.0. A theme color-code value could be handled unsafely, allowing script execution in a user's browser. Business risk is mainly to organizations still running very old Mattermost versions.
Executive priority
Treat this as a legacy-platform cleanup item unless an exposed, pre-3.1.0 Mattermost server is found. If found, prioritize upgrade because XSS can affect user trust and session safety.
Technical view
The CVE describes XSS through Mattermost theme color-code values in Mattermost Server versions before 3.1.0. The source bundle provides no CVSS score, CWE mapping, detailed attack prerequisites, or complete affected-version matrix beyond the before-3.1.0 statement.
Likely exposure
Exposure is likely limited to Mattermost Server deployments older than 3.1.0. The bundle does not identify hosted services, downstream packages, or exact configurations required.
Exploitation context
The CVE is not listed as KEV in the bundle, and no cited source states active exploitation. Public evidence here supports vulnerability existence, not exploitation in the wild.
Researcher notes
Available evidence is sparse: the CVE description names Mattermost Server before 3.1.0 and XSS through theme color-code values, but lacks CVSS, CWE, exploit details, and configuration conditions. Avoid assuming broader affected products.
Mitigation direction
- Upgrade Mattermost Server to 3.1.0 or later, following vendor guidance.
- Review Mattermost security updates for any related upgrade notes.
- Retire or isolate unsupported legacy Mattermost deployments.
- Limit theme customization privileges until the upgrade is confirmed.
Validation and detection
- Inventory Mattermost Server versions across managed environments.
- Confirm no production instance runs a version before 3.1.0.
- Review whether users can set custom theme color-code values.
- Check vendor security update records for the deployed release line.
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-2016-11070 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.