CVE-2021-37862

Name: CVE-2021-37862
Creator: NVD / NIST
Published: 2021-12-17T17:15:12.92+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.67%

Last modified Jun 17, 2026

CVE-2021-37862 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. Mattermost 6.0 and earlier fails to sufficiently validate the email address during registration, which allows attackers to trick users into signing up using attacker-controlled email addresses via crafted invitation token.. EPSS estimates a 0.67% chance of exploitation in the next 30 days.

Description

Mattermost 6.0 and earlier fails to sufficiently validate the email address during registration, which allows attackers to trick users into signing up using attacker-controlled email addresses via crafted invitation token.

Metrics

CVSS 3.1

5.4/10

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

EPSS Probability

0.67%

47.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Mattermost	Mattermost Server	<= 6.0

References

https://hackerone.com/reports/1357013Permissions Required
https://mattermost.com/security-updates/Vendor Advisory
https://hackerone.com/reports/1357013Permissions Required
https://mattermost.com/security-updates/Vendor Advisory

Timeline

Published: Dec 17, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-37862?

How severe is CVE-2021-37862?

CVE-2021-37862 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.67% probability of exploitation in the next 30 days.

How do I fix CVE-2021-37862?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-37862?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST