CVE-2020-14455Network attack vector

Phishing via mishandled HTTP Basic Authentication prompt

Published Jun 19, 2020 · Updated Aug 4, 2024

Authentication bypass in Mattermost Desktop App before 4.4.0 allows remote attackers to phish users via HTTP Basic Authentication prompts. The desktop client mishandles HTTP Basic Authentication prompts, allowing a malicious server to present a deceptive credential request. Remote unauthenticated access and user interaction are required, and the documented consequence is credential phishing rather than direct integrity or availability impact.

CVSS severity6.5
Medium
EPSS probability1.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Mattermost Desktop App before 4.4.0 allows remote attackers to phish users via HTTP Basic Authentication prompts. The desktop client mishandles HTTP Basic Authentication prompts, allowing a malicious server to present a deceptive credential request. Remote unauthenticated access and user interaction are required, and the documented consequence is credential phishing rather than direct integrity or availability impact.

The record

CVE
CVE-2020-14455
Published
Jun 19, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-287, T1056.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 19, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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

4.3NVDAV:N/AC:M/Au:N/C:P/I:N/A:N
6.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
T1056.002Input Capture: GUI Input Capture

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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