How severe is CVE-2025-54478?

CVE-2025-54478 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-54478 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-54478?

CVE-2025-54478 affects Mattermost Confluence. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-54478?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-54478 have an EU (EUVD) identifier?

Yes. CVE-2025-54478 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-24171.

When was CVE-2025-54478 published?

CVE-2025-54478 was published on 2025-08-11 and last updated on 2026-06-17.

CVE-2025-54478

CVE-2025-54478 is a high-severity vulnerability in Mattermost Confluence with a CVSS 3.x base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-306.

Key facts

Severity: High (CVSS 3.x base score 7.2)
EPSS exploit prediction: 0% (13th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-24171
Weakness: CWE-306
Affected product: Mattermost Confluence
Published: 2025-08-11
Last modified: 2026-06-17

Description

Mattermost Confluence Plugin version <1.5.0 fails to enforce authentication of the user to the Mattermost instance which allows unauthenticated attackers to edit channel subscriptions via API call to the edit channel subscription endpoint.

Frequently asked questions

What is CVE-2025-54478?: Mattermost Confluence Plugin version <1.5.0 fails to enforce authentication of the user to the Mattermost instance which allows unauthenticated attackers to edit channel subscriptions via API call to the edit channel subscription endpoint.
How severe is CVE-2025-54478?: CVE-2025-54478 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-54478 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-54478?: CVE-2025-54478 affects Mattermost Confluence. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-54478?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-54478 have an EU (EUVD) identifier?: Yes. CVE-2025-54478 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-24171.
When was CVE-2025-54478 published?: CVE-2025-54478 was published on 2025-08-11 and last updated on 2026-06-17.

References

https://mattermost.com/security-updates

Affected products (1)

cpe:2.3:a:mattermost:confluence:*:*:*:*:*:*:*:*

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