CVE-2020-13891Network attack vector

Authorization-token exposure via third-party servers

Published Jun 26, 2020 · Updated Aug 4, 2024

Information disclosure in Mattermost Mobile Apps before 1.31.2 on iOS allows remote attackers to obtain authorization tokens via unintended third-party servers. Mattermost identifies the token exposure but has not published the specific application component or unsafe operation that sends tokens to those servers. The condition requires the mobile app to interact with an unintended third-party server; the documented consequence is token confidentiality loss, with no reported integrity or availability impact.

CVSS severity7.5
High
EPSS probability1.07%
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 Mobile Apps before 1.31.2 on iOS allows remote attackers to obtain authorization tokens via unintended third-party servers. Mattermost identifies the token exposure but has not published the specific application component or unsafe operation that sends tokens to those servers. The condition requires the mobile app to interact with an unintended third-party server; the documented consequence is token confidentiality loss, with no reported integrity or availability impact.

The record

CVE
CVE-2020-13891
Published
Jun 26, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 26, 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

5.0NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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 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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