Is github.com/mattermost/mattermost-server affected by CVE-2017-18898?

Go github.com/mattermost/mattermost-server is affected in =4.1.0+incompatible =4.2.0-rc1+incompatible <4.2.0+incompatible.

Is CVE-2017-18898 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 1.1%.

medium

CVE-2017-18898

Q: Is CVE-2017-18898 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 1.1%.

Go · github.com/mattermost/mattermost-server

Summary

Mattermost Server is vulnerable to DoS through maliciously crafted posts in github.com/mattermost/mattermost-server

Severity: medium
EPSS: 1.1% (p61)
Also known as: GHSA-9589-mq83-f749, GO-2026-4300
Published: 2026-01-13

References

Related advisories

CVE-2026-6346 — high · Go/github.com/mattermost/mattermost-server
CVE-2026-6347 — high · Go/github.com/mattermost/mattermost-server
CVE-2026-6339 — medium · Go/github.com/mattermost/mattermost-server
CVE-2026-5163 — medium · Go/github.com/mattermost/mattermost-server
CVE-2026-28732 — medium · Go/github.com/mattermost/mattermost-server
CVE-2026-6345 — medium · Go/github.com/mattermost/mattermost-server
CVE-2026-6340 — medium · Go/github.com/mattermost/mattermost-server
CVE-2026-3637 — medium · Go/github.com/mattermost/mattermost-server

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.