Security readout for executives and security teams
Plain-English summary
Mattermost Server versions before 3.8.2, 3.7.5, and 3.6.7 had a cross-site scripting issue involving a link on an error page. The public record does not provide severity scoring or detailed prerequisites, so urgency depends on whether legacy Mattermost versions remain deployed.
Executive priority
Prioritize this when legacy Mattermost is still in use, especially for externally reachable collaboration systems. For fully upgraded environments, residual risk appears low, but the public severity record is incomplete.
Technical view
CVE-2017-18913 is an XSS vulnerability in Mattermost Server before fixed releases 3.8.2, 3.7.5, and 3.6.7. The CVE states XSS can occur via a link on an error page. No CVSS, CWE, authentication requirement, payload detail, or exploit chain is provided in the source bundle.
Likely exposure
Exposure is most likely limited to organizations still running Mattermost Server older than 3.8.2, 3.7.5, or 3.6.7. The source bundle’s affected-product metadata is incomplete, but the CVE description names Mattermost Server and fixed version thresholds.
Exploitation context
The sources do not indicate active exploitation, and the CVE is not listed as KEV in the bundle. The only described vector is XSS via a link on an error page. User interaction, authentication state, and exploit reliability are not documented in the provided sources.
Researcher notes
The record is sparse: no CVSS, CWE, detailed affected CPEs, exploit prerequisites, or patch notes are included in the source bundle. Treat product/version facts as coming from the CVE description and verify against Mattermost’s security update page.
Mitigation direction
- Upgrade Mattermost Server to 3.8.2, 3.7.5, 3.6.7, or newer.
- Review Mattermost security updates for branch-specific upgrade guidance.
- Retire or isolate legacy Mattermost instances that cannot be upgraded.
- Check vendor guidance before applying compensating controls.
Validation and detection
- Inventory all Mattermost Server instances and record exact versions.
- Compare versions against the fixed thresholds: 3.8.2, 3.7.5, and 3.6.7.
- Confirm no internet-facing legacy Mattermost deployments remain unpatched.
- Review security monitoring for suspicious Mattermost error-page link activity.
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-2017-18913 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.