What is CVE-2025-54458?

CVE-2025-54458 is a medium-severity vulnerability in Mattermost Confluence, classified under Missing Authorization. CVSS score: 5.0/10. Published 2025-08-11.

How severe is CVE-2025-54458?

Medium severity. CVSS v3 base score is 5.0 out of 10.

Is CVE-2025-54458 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Auth bypass in Mattermost Confluence

CVE-2025-54458

Mattermost Confluence Plugin version <1.5.0 fails to check the access of the user to the Confluence space which allows attackers to create a subscription for a Confluence space the user does not have access to via the create subscription e…

Vulnerability class: Broken Access Control

EPSS: 0.002 (9.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N.

Affected products

Mattermost Confluence
Mattermost Confluence Plugin — versions 0, 1.5.0

Weakness classification (CWE)

CWE-862 — Missing Authorization

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

responsibledisclosure@mattermost.com (Vendor Advisory)

Frequently asked questions

What is CVE-2025-54458?: CVE-2025-54458 is a medium-severity vulnerability in Mattermost Confluence, classified under Missing Authorization. CVSS score: 5.0/10. Published 2025-08-11.
How severe is CVE-2025-54458?: Medium severity. CVSS v3 base score is 5.0 out of 10.
Is CVE-2025-54458 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.