CVE-2025-21083Network attack vector

Authenticated mobile-app crash via malformed post props

Published Jan 15, 2025 · Updated Jan 15, 2025

Improper input validation in Mattermost Mobile Apps 2.22.0 and earlier allows remote authenticated users to crash the app via a malicious post. The vendor identifies post props as the validation locus but has not disclosed which prop type or rendering path triggers the crash. An attacker needs an account capable of publishing the crafted post; the documented consequence is interruption of a receiving mobile client.

CVSS severity6.5
Medium
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Mattermost Mobile Apps 2.22.0 and earlier allows remote authenticated users to crash the app via a malicious post. The vendor identifies post props as the validation locus but has not disclosed which prop type or rendering path triggers the crash. An attacker needs an account capable of publishing the crafted post; the documented consequence is interruption of a receiving mobile client.

The record

CVE
CVE-2025-21083
Published
Jan 15, 2025
Updated
Jan 15, 2025
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-1287, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Jan 15, 2025Record 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 <=2.22.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mattermost · Mattermostversion=0 <=2.22.0

Published CVSS scores

6.5Mattermost, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1287Improper Validation of Specified Type of Input
T1499.004Application or System Exploitation

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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