CVE-2019-20887

MEDIUM 4.3CVE-2019-20887 · Published 19/06/2020 · updated 17/06/2026

In short

CVE-2019-20887 is a MEDIUM (CVSS 4.3) vulnerability affecting mattermost server (mattermost).
Chance of exploitation in the next 30 days (EPSS): 0.65%, higher than 51.3% of all vulnerabilities.
Fix: update to 5.5.3, 5.6.4, 5.7.1, 4.10.6 or later.

Package	Affected versions	Patched versions
mattermost server mattermost	`≥ 5.5.0, < 5.5.3≥ 5.6.0, < 5.6.4≥ 5.7.0, < 5.7.1< 4.10.6`	`5.5.35.6.45.7.14.10.6`

Description

An issue was discovered in Mattermost Server before 5.7.1, 5.6.4, 5.5.3, and 4.10.6. It does not honor flags API permissions when deciding whether a user can receive intra-team posts.

References

mattermost.com/security-updates · Vendor Advisory

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Package

Affected versions

Patched versions

mattermost server

mattermost

≥ 5.5.0, < 5.5.3≥ 5.6.0, < 5.6.4≥ 5.7.0, < 5.7.1< 4.10.6

5.5.35.6.45.7.14.10.6

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