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CVE-2026-0998

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

Published: Feb 16, 2026Updated: Feb 18, 2026 Sources: CVE List NVD GHSACWE-862
NVD MITRE
4.3CVSSMEDIUM
EPSS Score
0.2%
Top 95.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-862

Affected Products

mattermost servermattermost
On-premWeb App
Communications / messaging-chat
zoommattermost
On-prem
Communications / messaging-chat
MattermostMattermost
On-premWeb App
Communications / messaging-chat
github.com/mattermost/mattermost-plugin-zoomGoOSS Libraries
mattermostcommercialUSCommunications
gopackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
View detailed technique mapping

References

https://mattermost.com/security-updates
mattermost.com
https://nvd.nist.gov/vuln/detail/CVE-2026-0998
nvd.nist.gov
https://github.com/mattermost/mattermost-plugin-zoom/commit/a8b58c43625ab25746e451acc4f71515d52c8122
github.com
and 1 more references View all →

Timeline

Published
Feb 16, 2026
Last Updated
Feb 18, 2026

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