CVE-2020-14457

mediumpriority · track · 21OT risk · elevatedEPSS 0.009 · 60 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.92% (60th) EPSS

CVSS 5 · medium

Is it mine?

6 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · osv · nvd

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

5.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.05mediumAV:N/AC:L/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 1.4

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:Nsecondary · OSV

v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-862US

affected products (6)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
mattermost mattermost server< 5.20.0nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
Bitnami mattermost< 5.20.0osvUSpkg:bitnami/mattermost
Go github.com/mattermost/mattermostall versionsosvUSpkg:golang/github.com/mattermost/mattermost
Go github.com/mattermost/mattermost-serverall versionsosvUSpkg:golang/github.com/mattermost/mattermost-server
Go github.com/mattermost/mattermost-server/v5< 5.20.0osvUSpkg:golang/github.com/mattermost/mattermost-server/v5

advisories (3)

Vendor and ecosystem advisories describing this.

GHSA-j2h2-cvwh-cr64Mattermost Server Sensitive Data Exposure2022-05-24ghsa · osvUS
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.
BIT-mattermost-2020-144572024-03-06vendor · osvUS
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.
GO-2023-1939Mattermost Server Sensitive Data Exposure in github.com/mattermost/mattermost2024-08-20vendor · osvUS
Mattermost Server Sensitive Data Exposure in github.com/mattermost/mattermost

also known as (6)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd osv nvd NVD CVE.org MITRE

published 2020-06-19modified 2026-06-17

references (4)

External citations — patches, advisories, analysis.

scry

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