CVE-2025-54478Network attack vector

Unauthenticated subscription edits via missing admin check

Published Aug 11, 2025 · Updated Aug 11, 2025

Missing authentication in Mattermost Confluence Plugin before 1.5.0 allows remote attackers to edit channel subscriptions through its API. The handleEditChannelSubscription handler processed requests without an IsSystemAdmin guard, allowing an unauthenticated identity to reach subscription-editing logic. Network access to an enabled plugin endpoint is sufficient, and exploitation changes notification subscription configuration without reported service interruption.

CVSS severity7.2
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in Mattermost Confluence Plugin before 1.5.0 allows remote attackers to edit channel subscriptions through its API. The handleEditChannelSubscription handler processed requests without an IsSystemAdmin guard, allowing an unauthenticated identity to reach subscription-editing logic. Network access to an enabled plugin endpoint is sufficient, and exploitation changes notification subscription configuration without reported service interruption.

The record

CVE
CVE-2025-54478
Published
Aug 11, 2025
Updated
Aug 11, 2025
Vendor
Mattermost
Product
Mattermost Confluence Plugin
Classifications
CWE-306
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

7.2MattermostCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

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-306Missing Authentication for Critical Function

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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