CVE-2025-14435Network attack vector

Authenticated client hang via unbounded profile rerenders

Published Jan 16, 2026 · Updated Jan 16, 2026

Denial of service in affected Mattermost releases allows remote authenticated users to hang web clients through remote-user profile rendering. In user_profile.tsx and related member views, React effects tie remote-display data and action references to fetches, so API errors repeatedly retrigger component rendering without a bound. Exploitation requires an authenticated account and user interaction with affected remote-user UI in Mattermost 10.11.0 through 10.11.8, 11.0.0 through 11.0.6, or 11.1.0 through 11.1.1; the rendering client is interrupted.

CVSS severity6.8
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in affected Mattermost releases allows remote authenticated users to hang web clients through remote-user profile rendering. In user_profile.tsx and related member views, React effects tie remote-display data and action references to fetches, so API errors repeatedly retrigger component rendering without a bound. Exploitation requires an authenticated account and user interaction with affected remote-user UI in Mattermost 10.11.0 through 10.11.8, 11.0.0 through 11.0.6, or 11.1.0 through 11.1.1; the rendering client is interrupted.

The record

CVE
CVE-2025-14435
Published
Jan 16, 2026
Updated
Jan 16, 2026
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 16, 2026Record 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=10.11.0 <=10.11.8
  2. Affected versionversion=11.0.0 <=11.0.6
  3. Affected versionversion=11.1.0 <=11.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mattermost · Mattermostversion=10.11.0 <=10.11.8; version=11.0.0 <=11.0.6; version=11.1.0 <=11.1.1

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.8Mattermost, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/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.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
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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