CVE-2019-20877Network attack vector

Unauthenticated disclosure of users' 2FA status

Published Jun 19, 2020 · Updated Aug 5, 2024

Information disclosure in Mattermost Server before 5.9.0, 5.8.1, 5.7.3, and 4.10.8 allows remote attackers to learn users' 2FA status. Mattermost has not published the vulnerable endpoint or the operation that exposes whether a user's two-factor authentication is enabled. No authentication or user interaction is required, and the reported consequence is limited to disclosure of the 2FA-enabled state.

CVSS severity5.3
Medium
EPSS probability0.92%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Mattermost Server before 5.9.0, 5.8.1, 5.7.3, and 4.10.8 allows remote attackers to learn users' 2FA status. Mattermost has not published the vulnerable endpoint or the operation that exposes whether a user's two-factor authentication is enabled. No authentication or user interaction is required, and the reported consequence is limited to disclosure of the 2FA-enabled state.

The record

CVE
CVE-2019-20877
Published
Jun 19, 2020
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 19, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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