Security readout for executives and security teams
Plain-English summary
This vulnerability affects Mattermost Server versions before 3.2.0. A malicious or malformed post could make a viewer's web browser hang, disrupting chat use for affected users. The sources do not provide CVSS scoring, broad impact details, or evidence of active exploitation.
Executive priority
Treat this as a low-complexity remediation for legacy Mattermost systems, not an emergency unless old instances remain broadly accessible to untrusted users.
Technical view
CVE-2016-11067 is a Mattermost Server issue fixed at the 3.2.0 release boundary. The recorded impact is browser hang from crafted posts, indicating client-side availability disruption through message content. Public metadata does not identify a CWE, CVSS vector, exploit maturity, or detailed root cause.
Likely exposure
Organizations running Mattermost Server before 3.2.0 are the only clearly supported exposure group. Exposure depends on whether untrusted users can create posts viewed by others.
Exploitation context
The provided sources do not report active exploitation, and the CVE is not listed as CISA KEV. The public description only states that crafted posts can cause a browser to hang.
Researcher notes
Evidence is sparse. The source bundle supports affected product and version boundary, observed browser hang behavior, and lack of KEV status, but not root cause, exploit details, or CVSS scoring.
Mitigation direction
- Identify any Mattermost Server deployments older than 3.2.0.
- Upgrade affected Mattermost Server instances to 3.2.0 or a vendor-supported later release.
- Review Mattermost security update guidance for any deployment-specific instructions.
- Limit posting rights from untrusted users until affected systems are upgraded.
Validation and detection
- Inventory Mattermost Server versions across production, staging, and legacy systems.
- Confirm no externally or broadly accessible instance is below version 3.2.0.
- Check historical support tickets for browser hangs triggered by specific posts.
- Verify upgrade completion through application version reporting.
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-2016-11067 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.