Security readout for executives and security teams
Plain-English summary
Mattermost Server had a vulnerability where attackers could obtain sensitive information during a role change. The public record names fixed releases but provides little detail about the exposed data, attacker prerequisites, or severity.
Executive priority
Prioritize remediation if Mattermost supports internal collaboration, incident response, or privileged team communications. The limited public detail lowers confidence, but sensitive information exposure in collaboration systems can create business and security risk.
Technical view
CVE-2019-20874 affects Mattermost Server before 5.9.0, 5.8.1, 5.7.3, and 4.10.8. The issue is described as sensitive information disclosure during a role change. No CVSS score, CWE, detailed attack path, or affected configuration details are provided in the supplied sources.
Likely exposure
Exposure is most likely limited to organizations running Mattermost Server versions older than the listed fixed releases. The sources do not define specific editions, configurations, hosting models, or permission prerequisites.
Exploitation context
The source bundle does not cite active exploitation, public exploit use, or CISA KEV listing. Exploitability details are incomplete, so assume risk depends on local Mattermost version and role-management exposure.
Researcher notes
Public evidence is sparse. The CVE description gives affected fixed versions and impact category only. No CVSS, CWE, prerequisites, vulnerable endpoint, or exploitation evidence were provided, so validation should focus on version confirmation and vendor advisory review.
Mitigation direction
- Upgrade Mattermost Server to 5.9.0, 5.8.1, 5.7.3, 4.10.8, or later supported releases.
- Check Mattermost security updates for branch-specific upgrade guidance.
- Prioritize systems where role changes are frequent or externally administered.
- Review access to administrative and role-management functions until patched.
Validation and detection
- Inventory all Mattermost Server versions in production and staging.
- Confirm each instance is at or above the fixed version for its branch.
- Review audit logs for unexpected role changes around vulnerable periods.
- Check vendor advisories for any newer remediation guidance.
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-2019-20874 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.