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CVE-2018-21252

MediumCVSS 4.3/10Last modified Jun 17, 2026

Description

An issue was discovered in Mattermost Server before 5.2, 5.1.1, 5.0.3, and 4.10.3. Attackers could use multiple e-mail addresses to bypass a domain-based policy for signups.

Metrics

CVSS 3.1 4.3/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Weakness enumeration

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

Timeline

Published: Jun 19, 2020
Last modified: Jun 17, 2026
NVD status: Modified

Related CVEs from 2018

CVE-2018-212534.3An issue was discovered in Mattermost Server before 5.1, 5.0.2, and 4.10.2. An attacker could use the invite_people slash command to invite CVE-2018-212544.3An issue was discovered in Mattermost Server before 5.1. An attacker can bypass intended access control (for direct-message channel creation CVE-2018-212554.3An issue was discovered in Mattermost Server before 5.1. Non-members of a channel could use the Channel PATCH API to modify that channel.CVE-2018-212564.3An issue was discovered in Mattermost Server before 5.1. It allows attackers to bypass intended access restrictions (for group-message chann CVE-2018-212575.3An issue was discovered in Mattermost Server before 5.1. It allows attackers to bypass intended access restrictions (for setting a channel h CVE-2018-212587.5An issue was discovered in Mattermost Server before 5.1. It allows attackers to cause a denial of service via the invite_people slash comman CVE-2018-212595.3An issue was discovered in Mattermost Server before 4.10.1, 4.9.4, and 4.8.2. It allows attackers to cause a denial of service (application CVE-2018-212602.7An issue was discovered in Mattermost Server before 4.8.1, 4.7.4, and 4.6.3. WebSocket events were accidentally sent during certain user-man CVE-2018-212614.3An issue was discovered in Mattermost Server before 4.8.1, 4.7.4, and 4.6.3. An e-mail invite accidentally included the team invite_id, whic CVE-2018-212627.5An issue was discovered in Mattermost Server before 4.7.3. It allows attackers to cause a denial of service (application crash) via invalid CVE-2018-212638.8An issue was discovered in Mattermost Server before 4.7.0, 4.6.2, and 4.5.2. An attacker could authenticate to a different user's account vi CVE-2018-212648.8An issue was discovered in Mattermost Server before 4.7.0, 4.6.2, and 4.5.2. It did not enforce the expiration date of a SAML response.

CVE-2018-21252: Medium severity, CVSS 4.3 | Vulnix