Is CVE-2026-0998 actively exploited?

CVE-2026-0998 has no public evidence of in-the-wild exploitation as of 2026-02-18.

What is the CVSS score for CVE-2026-0998?

CVE-2026-0998 has a CVSS score of 4.3 (MEDIUM severity). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

How do I patch CVE-2026-0998?

Patch guidance is available from mattermost security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-0998.

CVE-2026-0998 - remediation guidance & executive summary

Q: Which products are affected by CVE-2026-0998?

4 products: mattermost mattermost server, mattermost mattermost server, mattermost mattermost server, mattermost zoom.

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

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Attack Vector: network
Complexity: low
Privileges: low
User Action: none
Scope: unchanged
Confidentiality: none
Integrity: low
Availability: none
Weaknesses: CWE-862 · Missing Authorization

Metadata

Primary Vendor: MATTERMOST
Published: 2/16/2026
Last Modified: 2/18/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

mattermost : mattermost_servermattermost : mattermost_servermattermost : mattermost_servermattermost : zoom

Remediation Guidance

Executive Summary

Cite this page

CVE-2026-0998. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2026-0998

View on NIST NVD

CVE-2026-0998 vulnerability