# CVE-2026-0998: mattermost-plugin-zoom — Fixed in 1.12.0

🐹

🐹 Go

Not in CISA KEV

MEDIUM severity

# CVE-2026-0998 — mattermost-plugin-zoom

MEDIUM [Fix: mattermost/mattermost-plugin-zoom@a8b58c4](https://github.com/mattermost/mattermost-plugin-zoom/commit/a8b58c43625ab25746e451acc4f71515d52c8122)

CVE-2026-0998 is a medium-severity (CVSS 4.3) CWE-862 vulnerability in github.com/mattermost/mattermost-plugin-zoom. A fix is available for github.com/mattermost/mattermost-plugin-zoom — see the affected versions and patch details below.

Mattermost Zoom Plugin allows unauthorized meeting creation and post modification via insufficient API access controls

Also known as[GHSA-w65c-fvp5-fvc5](/vulnerability/GHSA-w65c-fvp5-fvc5)GO-2026-4525

Published

Feb 16, 2026

Updated

Nov 7, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 9, 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 CVE-2026-0998.

## EPSS Exploitation Probability

[via FIRST.org ↗](https://www.first.org/epss/)

0.2%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs7th percentile — riskier than 7% of all scored CVEsHighest risk

0.00%0.23%0.45%0.68%0.0%0.2%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from [FIRST.org EPSS](https://www.first.org/epss/).

## How urgent is this, really

## Where this sits among everything scored

## Real-World Exposure

1 pkg affected

🐹`github.com/mattermost/mattermost-plugin-zoom`

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 versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 and Mattermost Plugin Zoom versions <=1.11.0 fail to validate user identity and post ownership in the {{/api/v1/askPMI}} endpoint which allows unauthorized users to start Zoom meetings as any user and overwrite arbitrary posts via direct API calls with manipulated user IDs and post data.. Mattermost Advisory ID: MMSA-2025-00534

## Affected Packages

1 total 1 fixed

Ecosystem

Package

Vulnerable range

Fix

🐹Go

`github.com/mattermost/mattermost-plugin-zoom` 

all versions

1.12.0`go get github.com/mattermost/mattermost-plugin-zoom@v1.12.0`

## Affected Products

2 products · 4 configurations

Application

`mattermost server`mattermost

≥ 11.2.0 && < 11.2.2

range

Application

`zoom`mattermost

≤ 1.11.0

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-zoom, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
    
2.  ### Fix
    
    Update github.com/mattermost/mattermost-plugin-zoom to 1.12.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-0998 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 versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 and Mattermost Plugin Zoom versions <=1.11.0 fail to validate user identity and post ownership in the {{/api/v1/askPMI}} endpoint which allows unauthorized users to start Zoom meetings as any user and overwrite arbitrary posts via direct API calls with manipulated user IDs and post data.. Mattermost Advisory ID: MMSA-2025-00534

O3 Security · Impact-Aware SCA

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