Security readout for executives and security teams
Plain-English summary
Mattermost guest users could see a team-wide list of public channels they had not joined. This is an information exposure issue, not a system takeover. The business concern is leakage of channel names that may reveal projects, clients, incidents, or internal functions.
Executive priority
Treat as moderate priority. It is unlikely to cause direct compromise, but it can expose sensitive organizational context to guest users and should be remediated during the next planned Mattermost maintenance window.
Technical view
CVE-2022-2408 affects Mattermost 6.7.0 and earlier guest account permissions. A guest user with valid access could fetch all public channels in a team despite not belonging to those channels. The issue is mapped to CWE-200 with CVSS 3.1 score 4.3.
Likely exposure
Exposure is limited to Mattermost deployments using guest accounts on affected versions, especially teams where public channel names contain sensitive business context.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation evidence. Exploitation requires a low-privileged guest account and network access to the Mattermost instance.
Researcher notes
The provided evidence identifies the affected behavior and versions but does not include a fixed version, patch note, or exploit report. Avoid claiming active exploitation or specific remediation beyond Mattermost vendor guidance.
Mitigation direction
- Identify Mattermost instances running 6.7.0 or earlier.
- Review Mattermost security updates for CVE-2022-2408 remediation guidance.
- Apply the vendor-recommended update or mitigation once confirmed.
- Review whether guest accounts are still required.
- Avoid sensitive information in public channel names.
Validation and detection
- Inventory Mattermost versions and guest-account usage.
- Confirm whether affected teams allow guest access.
- Review public channel names for sensitive business identifiers.
- Check vendor advisory status before closing remediation.
- Document compensating controls if upgrade timing is delayed.
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.
CWE-200: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2022-2408 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
- Medium
- CVSS
- 4.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N2.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://mattermost.com/security-updates/CVE reference · x_refsource_MISC
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.
Exposure of Sensitive Information to an Unauthorized Actor
Exposure of Sensitive Information to an Unauthorized Actor represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.