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CVE-2017-18889 Moderate

Mattermost Server is vulnerable to webhook and slash command manipulation in github.com/mattermost/mattermost-server

Mattermost Server is vulnerable to webhook and slash command manipulation in github.com/mattermost/mattermost-server

Exploit probability 0.7%
Published December 15, 2025
Required by Not available
Last source change March 3, 2026

02 / AFFECTED SOFTWARE

Affected packages

Unknown Unknown

14 explicit affected versions

Go github.com/mattermost/mattermost-server
Go github.com/mattermost/mattermost-server

03 / CONNECTIONS

Connected vulnerabilities

related OPENSUSE-SU-2026:21483-1

04 / EVIDENCE

Source records

Open Source Vulnerabilities GO-2025-4201

Mattermost Server is vulnerable to webhook and slash command manipulation in github.com/mattermost/mattermost-server

View original source
Open Source Vulnerabilities GHSA-jp57-4x34-5v94

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.

View original source
Open Source Vulnerabilities CVE-2017-18889

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.

View original source

05 / REFERENCES

Further evidence