CVE-2025-52931: Mattermost Confluence Plugin version <1.5.0 fails to handle unexpected request body which allows attackers to

Q: How do I fix CVE-2025-52931?

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

Q: Is CVE-2025-52931 being exploited?

CVE-2025-52931 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-2025-52931 affect?

CVE-2025-52931 affects confluence. Severity is high (CVSS 7.5). Mattermost Confluence Plugin version <1.5.0 fails to handle unexpected request body which allows attackers to crash the plugin via constant hit to update channel subscription endpoint with an invalid request body.

Q: How urgent is CVE-2025-52931?

Priority 38/100. High severity; Remotely exploitable, no login, no user action

Routine

HIGH 7.5REMOTEUPGRADE

CVE-2025-52931 is a high-severity flaw (CVSS 7.5) 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 handle unexpected request body which allows attackers to crash the plugin via constant hit to update channel subscription endpoint with an invalid request body.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 73%)
CISA exploited list	No
Weakness	CWE-754
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 09:37 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-2025-52931?

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

Is CVE-2025-52931 being exploited?

CVE-2025-52931 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-2025-52931 affect?

CVE-2025-52931 affects confluence. Severity is high (CVSS 7.5). Mattermost Confluence Plugin version <1.5.0 fails to handle unexpected request body which allows attackers to crash the plugin via constant hit to update channel subscription endpoint with an invalid request body.

How urgent is CVE-2025-52931?

Priority 38/100. High severity; Remotely exploitable, no login, no user action

Software pages

Atlassian Confluence vulnerabilities · Mattermost vulnerabilities

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References

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