CVE-2025-41395Network attack vector

Webapp crash via unvalidated retrospective metric props

Published Apr 24, 2025 · Updated Apr 24, 2025

Input validation failure in Mattermost 9.11.0 through 9.11.10, 10.4.0 through 10.4.2, and 10.5.0 allows attackers to crash the web app. RetrospectivePost directly passes metricsConfigs and metricsData props to JSON.parse without checking for valid JSON or expected metric-array types. An authenticated account can submit the crafted post, and rendering it interrupts the web app for all users.

CVSS severity6.5
Medium
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Input validation failure in Mattermost 9.11.0 through 9.11.10, 10.4.0 through 10.4.2, and 10.5.0 allows attackers to crash the web app. RetrospectivePost directly passes metricsConfigs and metricsData props to JSON.parse without checking for valid JSON or expected metric-array types. An authenticated account can submit the crafted post, and rendering it interrupts the web app for all users.

The record

CVE
CVE-2025-41395
Published
Apr 24, 2025
Updated
Apr 24, 2025
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-1287, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 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=10.4.0 <=10.4.2
  2. Affected versionversion=10.5.0
  3. Affected versionversion=9.11.0 <=9.11.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mattermost · Mattermostversion=10.4.0 <=10.4.2; version=10.5.0; version=9.11.0 <=9.11.10

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
7.5NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/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.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1287Improper Validation of Specified Type of Input
T1499Endpoint Denial of Service

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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