CVE-2019-20863
An issue was discovered in Mattermost Server before 5.13.0. Incoming webhook creation is not...
An issue was discovered in Mattermost Server before 5.13.0. Incoming webhook creation is not properly restricted.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
An issue was discovered in Mattermost Server before 5.13.0. Incoming webhook creation is not properly restricted.
- Record
CVE-2019-20863- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:P/A:N - Updated
- 2026-11-02
CVE List No score
An issue was discovered in Mattermost Server before 5.13.0. Incoming webhook creation is not properly restricted.
- Record
CVE-2019-20863- Updated
- 2026-11-02
EUVDEUVD-2019-11400 No score
An issue was discovered in Mattermost Server before 5.13.0. Incoming webhook creation is not properly restricted.
- Record
EUVD-2019-11400- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-gp62-jrm3-m52m No score
An issue was discovered in Mattermost Server before 5.13.0. Incoming webhook creation is not...
An issue was discovered in Mattermost Server before 5.13.0. Incoming webhook creation is not properly restricted.
- Record
GHSA-gp62-jrm3-m52m- Updated
- 2026-11-02
OSV
An issue was discovered in Mattermost Server before 5.13.0. Incoming webhook creation is not properly restricted.
- Record
CVE-2019-20863- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2019-20863 is a high vulnerability (CVSS 7.5) in Mattermost Server, published June 19, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.94%, the 61st percentile. No source names a fixed version.