CVE-2020-14457 json
Mattermost Server Sensitive Data Exposure
published 2020-06-19 6 y ago modified 2026-06-17 4 mo ago also BIT-mattermost-2020-14457 , EUVD-2022-4257 , GHSA-j2h2-cvwh-cr64 , GO-2023-1939
- cvss
- 5.3
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.9%
- EPSS 0.9% chance of exploitation in 30 days, percentile 60%
- public exploits
- 0
- none known
Summary
An issue was discovered in Mattermost Server before 5.20.0. Non-members can receive broadcasted team details via the update_team WebSocket event, aka MMSA-2020-0012.
Patch / fix
- go github.com/mattermost/mattermost-server/v5 5.20.0
- bitnami mattermost 5.20.0
- mattermost mattermost_server 5.20.0
- github.com/mattermost/mattermost#13848 pull request
Exploit prediction
0.92% chance of exploitation in the next 30 days, higher than 60% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| GitHub | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
| NVD | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:P/I:N/A:N |
| OSV | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/mattermost/mattermost-server/v5 | <5.20.0 |
5.20.0 |
| bitnami | mattermost | <5.20.0 |
5.20.0 |
| go | github.com/mattermost/mattermost | all versions |
no fix listed |
| go | github.com/mattermost/mattermost-server | all versions |
no fix listed |
Classification
- Weakness
-
- CWE-862 Missing Authorization
References
-
github.com
/mattermost/mattermost/pull/13848
web, patch
-
mattermost.com
/security-updates/
vendor-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2020-14457
advisory, web
-
github.com
/mattermost/mattermost
package
-
mattermost.com
/security-updates
web
-
github.com
/advisories/GHSA-j2h2-cvwh-cr64
advisory
Sources
- CVE List CVE-2020-14457
- GitHub Advisory GHSA-j2h2-cvwh-cr64
- NVD CVE-2020-14457
- OSV BIT-mattermost-2020-14457
- OSV GO-2023-1939
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.