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MEDIUM severity

GHSA-qjrx-j8wm-xf83 — mattermost-plugin-conflue…

MEDIUM

GHSA-qjrx-j8wm-xf83 is a medium-severity (CVSS 4) CWE-862 vulnerability in github.com/mattermost/mattermost-plugin-confluence. A fix is available for github.com/mattermost/mattermost-plugin-confluence — see the affected versions and patch details below.

Mattermost Confluence Plugin has Missing Authorization vulnerability

Also known asCVE-2025-8285GO-2025-3868
Published
Aug 11, 2025
Updated
Sep 24, 2025
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Sep 27, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-qjrx-j8wm-xf83.

EPSS Exploitation Probability

via FIRST.org ↗
0.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs8th percentile — riskier than 8% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

GHSA-qjrx-j8wm-xf83 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 379,842 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🐹github.com/mattermost/mattermost-plugin-confluence

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

Mattermost Confluence Plugin versions < 1.5.0 fail to check the access of the user to the channel which allows attackers to create channel subscription without proper access to the channel via API call to the create channel subscription endpoint.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/mattermost/mattermost-plugin-confluenceall versions1.5.0go get github.com/mattermost/mattermost-plugin-confluence@v1.5.0

Affected Products

1 product · 1 configurations
Application
confluencemattermost
< 1.5.0
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/mattermost/mattermost-plugin-confluence, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update github.com/mattermost/mattermost-plugin-confluence to 1.5.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-qjrx-j8wm-xf83 is resolved across your whole dependency graph.

  3. Workarounds

    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Frequently Asked Questions

Mattermost Confluence Plugin versions < 1.5.0 fail to check the access of the user to the channel which allows attackers to create channel subscription without proper access to the channel via API call to the create channel subscription endpoint.
O3 Security · Impact-Aware SCA

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GHSA-qjrx-j8wm-xf83: Medium 4 severity | O3 Security