cve.bz

CVE-2017-18889

4.3 mediumEPSS 0.7%

An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. An attacker could create fictive system-message posts via webhooks and slash commands, in the v3 or v4 REST API.

Severity

CVSS 3.1

4.3 medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
EPSS
0.7% chance of exploitation in the next 30 days; higher than 51% of CVEs (scores of 2026-10-31)
CWE
CWE-20
Published
Modified
Record from
the NVD, synced

Affected

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-jp57-4x34-5v94Gogithub.com/mattermost/mattermost-server<4.1.24.1.2
GHSA-jp57-4x34-5v94Gogithub.com/mattermost/mattermost-server>=4.2.0-rc1 <4.2.14.2.1
GHSA-jp57-4x34-5v94Gogithub.com/mattermost/mattermost-server>=4.3.0-rc1 <4.3.04.3.0
GO-2025-4201Gogithub.com/mattermost/mattermost-server<4.1.2+incompatible
>=4.2.0-rc1+incompatible <4.2.1+incompatible
>=4.3.0-rc1+incompatible <4.3.0+incompatible		4.1.2+incompatible, 4.2.1+incompatible, 4.3.0+incompatible

References

Check your stackJSON