CVE Tools
Sign in

CVE-2026-26230

Team Admin Privilege Escalation to Demote Members to Guest

Published: Mar 16, 2026Updated: Mar 18, 2026 Sources: CVE List NVD BDUCWE-863
NVD MITRE
3.8CVSSLOW
EPSS Score
0.2%
Top 94.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

Mattermost versions 10.11.x <= 10.11.10 fail to properly validate permission requirements in the team member roles API endpoint which allows team administrators to demote members to guest role. Mattermost Advisory ID: MMSA-2025-00531

CVSS Vector Breakdown

AV:NAC:LPR:HUI:NS:UC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-863

Affected Products

mattermost servermattermost
On-premWeb App
Communications / messaging-chat
MattermostMattermost Inc
On-premWeb App
Communications / messaging-chat
MattermostMattermost
On-premWeb App
Communications / messaging-chat
mattermostcommercialUSCommunications
mattermost inccommercialUSCommunicationsaka mattermost

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
View detailed technique mapping

References

https://mattermost.com/security-updates
mattermost.com

Timeline

Published
Mar 16, 2026
Last Updated
Mar 18, 2026

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2026-26230 and every CVE in our database. Create a free account — no credit card required.

Create Free Account
Plain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows