CVE-2023-3615Network attack vector

WebSocket interception via missing certificate validation

Published Jul 17, 2023 · Updated Oct 30, 2024

Improper certificate validation in Mattermost Mobile 2.5.0 and earlier allows remote attackers to intercept WebSocket connections. The iOS app fails to validate the server certificate when initializing TLS for a WebSocket connection. Successful exploitation requires control of the network path but no account or user interaction, exposing intercepted session traffic to reading or alteration.

CVSS severity8.1
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in Mattermost Mobile 2.5.0 and earlier allows remote attackers to intercept WebSocket connections. The iOS app fails to validate the server certificate when initializing TLS for a WebSocket connection. Successful exploitation requires control of the network path but no account or user interaction, exposing intercepted session traffic to reading or alteration.

The record

CVE
CVE-2023-3615
Published
Jul 17, 2023
Updated
Oct 30, 2024
Vendor
Mattermost
Product
Mattermost Mobile
Classifications
CWE-295, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 17, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 30, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=2.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mattermost · Mattermost Mobileversion=0 <=2.5.0

Published CVSS scores

8.1Mattermost, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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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

CWE-295Improper Certificate Validation
T1557Adversary-in-the-Middle

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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