CVE-2025-52931Network attack vector

Plugin crash via repeated malformed subscription updates

Published Aug 11, 2025 · Updated Aug 11, 2025

Improper exceptional-condition handling in Mattermost Confluence Plugin before 1.5.0 allows remote attackers to crash the plugin. The update channel subscription endpoint fails to handle an invalid request body, and sustained malformed requests terminate the plugin. No authentication or user interaction is required; the reported consequence is plugin availability loss, not data access or modification.

CVSS severity7.5
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper exceptional-condition handling in Mattermost Confluence Plugin before 1.5.0 allows remote attackers to crash the plugin. The update channel subscription endpoint fails to handle an invalid request body, and sustained malformed requests terminate the plugin. No authentication or user interaction is required; the reported consequence is plugin availability loss, not data access or modification.

The record

CVE
CVE-2025-52931
Published
Aug 11, 2025
Updated
Aug 11, 2025
Vendor
Mattermost
Product
Mattermost Confluence Plugin
Classifications
CWE-754, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 11, 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 <1.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mattermost · Mattermost Confluence Pluginversion=0 <1.5.0

Published CVSS scores

7.5MattermostCVSS: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.

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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-754Improper Check for Unusual or Exceptional Conditions
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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