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TI-2017-14039 Aliases CVE-2017-18891GHSA-vrh2-rprg-rgc6

An issue was discovered in Mattermost Server before 4.2.0, 4.1.1, and 4.0.5.

Priority LOW 28CWE-601Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Spoofing
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-601.

Summary

An issue was discovered in Mattermost Server before 4.2.0, 4.1.1, and 4.0.5. It allows Phishing because an error page can have a link.

Why it matters now

EPSS 0.00691 53rd percentileScored 2026-11-07
Fix Fixed github.com/mattermost/mattermost-server (Go): 4.0.5, 4.1.1, 4.2.0

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
—github.com/mattermost/mattermost-server (Go)before 4.0.54.0.5Patch availableGHSA-vrh2-rprg-rgc6
—github.com/mattermost/mattermost-server (Go)4.1.0 to before 4.1.14.1.1Patch availableGHSA-vrh2-rprg-rgc6
—github.com/mattermost/mattermost-server (Go)4.2.0-rc1 to before 4.2.04.2.0Patch availableGHSA-vrh2-rprg-rgc6
  • — Vendor— Affected all versions Fixed in — No fix listed CNA
  • github.com/mattermost/mattermost-server (Go) Vendor— Affected before 4.0.5 Fixed in 4.0.5 Patch available GHSA-vrh2-rprg-rgc6
  • github.com/mattermost/mattermost-server (Go) Vendor— Affected 4.1.0 to before 4.1.1 Fixed in 4.1.1 Patch available GHSA-vrh2-rprg-rgc6
  • github.com/mattermost/mattermost-server (Go) Vendor— Affected 4.2.0-rc1 to before 4.2.0 Fixed in 4.2.0 Patch available GHSA-vrh2-rprg-rgc6

CPE configurations NVD · 5

CPEVersionsRoleVendor
cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*before 4.0.5; 4.1.0 to before 4.1.1VulnerableMattermost
cpe:2.3:a:mattermost:mattermost_server:4.2.0:rc1:*:*:*:*:*:*4.2.0 rc1VulnerableMattermost
cpe:2.3:a:mattermost:mattermost_server:4.2.0:rc2:*:*:*:*:*:*4.2.0 rc2VulnerableMattermost
cpe:2.3:a:mattermost:mattermost_server:4.2.0:rc3:*:*:*:*:*:*4.2.0 rc3VulnerableMattermost
cpe:2.3:a:mattermost:mattermost_server:4.2.0:rc4:*:*:*:*:*:*4.2.0 rc4VulnerableMattermost
  • cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* Versions before 4.0.5; 4.1.0 to before 4.1.1 Vulnerable ·Mattermost
  • cpe:2.3:a:mattermost:mattermost_server:4.2.0:rc1:*:*:*:*:*:* Versions 4.2.0 rc1 Vulnerable ·Mattermost
  • cpe:2.3:a:mattermost:mattermost_server:4.2.0:rc2:*:*:*:*:*:* Versions 4.2.0 rc2 Vulnerable ·Mattermost
  • cpe:2.3:a:mattermost:mattermost_server:4.2.0:rc3:*:*:*:*:*:* Versions 4.2.0 rc3 Vulnerable ·Mattermost
  • cpe:2.3:a:mattermost:mattermost_server:4.2.0:rc4:*:*:*:*:*:* Versions 4.2.0 rc4 Vulnerable ·Mattermost

Remediation

  • Fix · GHSA-vrh2-rprg-rgc6 github.com/mattermost/mattermost-server (Go) Fixed in 4.0.5 Advisory →
  • Fix · GHSA-vrh2-rprg-rgc6 github.com/mattermost/mattermost-server (Go) Fixed in 4.1.1 Advisory →
  • Fix · GHSA-vrh2-rprg-rgc6 github.com/mattermost/mattermost-server (Go) Fixed in 4.2.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2017-18891
  2. 2026-10-03 Alias added: GHSA-vrh2-rprg-rgc6

References

Advisory 2

Other 3

  • TI-2025-18933 Arbitrary file read in Mattermost Boards via import & export board archive CVSS 3.1CRITICAL 9.9
  • TI-2025-04465 Path Traversal Leading to RCE by Any Authenticated Mattermost User CVSS 3.1CRITICAL 9.9
  • TI-2017-14068 An issue was discovered in Mattermost Server before 3.6.2. CVSS 3.1CRITICAL 9.8
  • TI-2017-14060 An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. CVSS 3.1CRITICAL 9.8
  • TI-2017-14048 An issue was discovered in Mattermost Server before 4.1.0, 4.0.4, and 3.10.3. CVSS 3.1CRITICAL 9.8
  • TI-2025-14360 Arbitrary file read via block duplication in Mattermost Boards CVSS 3.1CRITICAL 9.9
See all 505 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences