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CVE-2019-20864

23
FAUCET Score

CVE-2019-20864 is a high-severity vulnerability affecting Mattermost Plugins prior to version 5.13.0, specifically within the GitHub plugin. An attacker can exploit this flaw to link their Mattermost account to a different user's GitHub account, leading to an integrity compromise. While no public exploit code or active exploitation has been observed, and community discussion is minimal, the vulnerability has a CVSS score of 7.5, indicating a significant risk if exploited.

Impacted Technologies

VendorProductVersion(s)CPE
< 5.13.0CPE matchmatch criteria
cpe:2.3:a:mattermost:mattermost_plugins:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.87%
Probability of exploitation in next 30 days
EPSS Percentile
55.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0087 is in the 30th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

mattermost.com / security-updates
Vendor Advisory