CVE-2019-20864

Name: CVE-2019-20864
Creator: NVD / NIST
Published: 2020-06-19T15:15:10.993+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.87%

Last modified Jun 17, 2026

CVE-2019-20864 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. An issue was discovered in Mattermost Plugins before 5.13.0. The GitHub plugin allows an attacker to attach his Mattermost account to a different person's GitHub account.. EPSS estimates a 0.87% chance of exploitation in the next 30 days.

Description

An issue was discovered in Mattermost Plugins before 5.13.0. The GitHub plugin allows an attacker to attach his Mattermost account to a different person's GitHub account.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.87%

54.2th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Mattermost	Mattermost Plugins	< 5.13.0

References

https://mattermost.com/security-updates/Vendor Advisory
https://mattermost.com/security-updates/Vendor Advisory

Timeline

Published: Jun 19, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-20864?

An issue was discovered in Mattermost Plugins before 5.13.0. The GitHub plugin allows an attacker to attach his Mattermost account to a different person's GitHub account.

How severe is CVE-2019-20864?

CVE-2019-20864 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.87% probability of exploitation in the next 30 days.

How do I fix CVE-2019-20864?

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-2019-20864?

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

Scan your code now

Source: NVD / NIST