CVE-2025-54478: Mattermost Confluence Plugin version <1.5.0 fails to enforce authentication of the user to the Mattermost inst

Q: How do I fix CVE-2025-54478?

confluence: upgrade to 1.5.0. Exact commands for each OS are on this page.

Q: Is CVE-2025-54478 being exploited?

CVE-2025-54478 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-54478 affect?

CVE-2025-54478 affects confluence. Severity is high (CVSS 7.2). 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.

Q: How urgent is CVE-2025-54478?

Priority 34/100. High severity; Remotely exploitable, no login, no user action

Routine

HIGH 7.2REMOTEUPGRADE

CVE-2025-54478 is a high-severity flaw (CVSS 7.2) affecting confluence. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-306
Published	2025-08-11
Last modified	2026-06-17

Publisher (CNA): Mattermost, Inc. · Vendor: mattermost

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-08-11 19:15 UTCPublished CVE record published
2026-06-17 09:40 UTCUpdated Record last modified

mattermost confluence UPGRADE

Affected: < 1.5.0

Fixed in: 1.5.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy confluence || rpm -q confluence || confluence --version

2. UPGRADE to 1.5.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade confluence

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade confluence

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-54478?

confluence: upgrade to 1.5.0. Exact commands for each OS are on this page.

Is CVE-2025-54478 being exploited?

CVE-2025-54478 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-54478 affect?

CVE-2025-54478 affects confluence. Severity is high (CVSS 7.2). 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 urgent is CVE-2025-54478?

Priority 34/100. High severity; Remotely exploitable, no login, no user action

Software pages

Atlassian Confluence vulnerabilities · Mattermost vulnerabilities

Related CVEs

CVE-2025-8285 MEDIUM 4.0 UPGRADE Mattermost Confluence Plugin version <1.5.0 fails to check the access of the user to the channel which allows
CVE-2025-54525 HIGH 7.5 UPGRADE Mattermost Confluence Plugin version <1.5.0 fails to handle unexpected request body which allows attackers to
CVE-2025-54463 MEDIUM 5.9 UPGRADE Mattermost Confluence Plugin version <1.5.0 fails to handle unexpected request body which allows attackers to
CVE-2025-54458 MEDIUM 5.0 UPGRADE Mattermost Confluence Plugin version <1.5.0 fails to check the access of the user to the Confluence space whic
CVE-2025-53910 MEDIUM 4.0 UPGRADE Mattermost Confluence Plugin version <1.5.0 fails to check the access of the user to the channel which allows

References

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