Security readout for executives and security teams
Plain-English summary
Mattermost Server versions before 3.0.0 had a cross-site scripting issue tied to redirect URLs. In business terms, a vulnerable legacy deployment could expose users to malicious script execution in a trusted collaboration environment. The source bundle does not provide severity, CVSS, or evidence of active exploitation.
Executive priority
Prioritize this if the organization still runs legacy Mattermost Server. With no severity score or exploitation evidence in the bundle, urgency depends mainly on whether pre-3.0.0 systems remain exposed.
Technical view
CVE-2016-11079 is described as XSS in Mattermost Server before 3.0.0 via a redirect URL. The provided record has no CVSS vector, CWE mapping, CPE list, or detailed affected-version matrix beyond “before 3.0.0.”
Likely exposure
Exposure is limited to organizations still operating Mattermost Server before 3.0.0. The bundle does not identify affected CPEs, hosted service impact, configuration prerequisites, or whether unsupported forks are affected.
Exploitation context
The CVE is not marked as CISA KEV, and the provided sources do not state active exploitation. The bundle also does not include proof-of-concept details, attacker prerequisites, or observed campaign activity.
Researcher notes
The public bundle is sparse: it identifies Mattermost Server before 3.0.0 and XSS via redirect URL, but omits CVSS, CWE, CPEs, exploit status, and patch details beyond the version boundary. Avoid over-scoping without vendor confirmation.
Mitigation direction
- Inventory all Mattermost Server instances and record exact versions.
- Treat Mattermost Server versions before 3.0.0 as potentially affected.
- Review Mattermost security updates for official remediation guidance.
- Upgrade legacy affected systems to a vendor-supported release after testing.
- Retire unsupported Mattermost instances that cannot be upgraded.
Validation and detection
- Confirm whether any deployed Mattermost Server version is before 3.0.0.
- Check asset inventories, container images, and deployment manifests for legacy versions.
- Review vendor security guidance for this CVE and related Mattermost advisories.
- Validate upgrade completion in production and backup environments.
- Confirm no public routes still expose retired legacy Mattermost instances.
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-2016-11079 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.