CVE-2017-18915

CRITICALNVD 9.89.8—

9.8

An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. After a restart of a server, an attacker might suddenly gain API Endpoint access.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 61.4%
KEV: Not listed

Published

June 19, 2020

Last Modified

November 21, 2024

References (2)

cve@mitrehttps://mattermost.com/security-updates/
af854a3a-2127-422b-91ae-364da2661108https://mattermost.com/security-updates/

Affected Packages

(1 across 1 ecosystem)

Go(1)

Package	Vulnerable range	Fixed in	Dependents
github.com/mattermost/mattermost-server	—	3.8.2+incompatible	—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-276Incorrect Default Permissions

Data Freshness Timeline

(refreshed 8× in last 7d / 8× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:38 UTCepss_batch
2026-05-27 13:38 UTCepss_batch
2026-05-27 02:08 UTCEG score recompute
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-23 13:41 UTCOSV refresh

Frequently asked(5)

What is CVE-2017-18915?

CVE-2017-18915 is a critical vulnerability published on June 19, 2020. An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. After a restart of a server, an attacker might suddenly gain API Endpoint access.

When was CVE-2017-18915 disclosed?

CVE-2017-18915 was first published in the National Vulnerability Database on June 19, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2017-18915 actively exploited?

CVE-2017-18915 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 61.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2017-18915?

CVE-2017-18915 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2017-18915?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-18915, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2017-18915

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Is Your Infrastructure Affected by CVE-2017-18915?

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