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Global data_breach → Government CRITICAL 9h Global ransomware → Financial Services / Cybersecurity CRITICAL 9h Global vulnerability → Information Technology / Cybersecurity CRITICAL 11h Global malware → Energy and Utilities CRITICAL 12h Global ransomware → Multiple sectors CRITICAL 12h Global vulnerability → Industrial Control Systems / IoT / Infrastructure CRITICAL 15h Global supply_chain → Information Technology and Critical Infrastructure CRITICAL 15h Global phishing → Multiple sectors HIGH 16h Global insider → Cybersecurity Services CRITICAL 16h Global ransomware → Multiple sectors (U.S. companies) CRITICAL 16h Global data_breach → Government CRITICAL 9h Global ransomware → Financial Services / Cybersecurity CRITICAL 9h Global vulnerability → Information Technology / Cybersecurity CRITICAL 11h Global malware → Energy and Utilities CRITICAL 12h Global ransomware → Multiple sectors CRITICAL 12h Global vulnerability → Industrial Control Systems / IoT / Infrastructure CRITICAL 15h Global supply_chain → Information Technology and Critical Infrastructure CRITICAL 15h Global phishing → Multiple sectors HIGH 16h Global insider → Cybersecurity Services CRITICAL 16h Global ransomware → Multiple sectors (U.S. companies) CRITICAL 16h Global data_breach → Government CRITICAL 9h Global ransomware → Financial Services / Cybersecurity CRITICAL 9h Global vulnerability → Information Technology / Cybersecurity CRITICAL 11h Global malware → Energy and Utilities CRITICAL 12h Global ransomware → Multiple sectors CRITICAL 12h Global vulnerability → Industrial Control Systems / IoT / Infrastructure CRITICAL 15h Global supply_chain → Information Technology and Critical Infrastructure CRITICAL 15h Global phishing → Multiple sectors HIGH 16h Global insider → Cybersecurity Services CRITICAL 16h Global ransomware → Multiple sectors (U.S. companies) CRITICAL 16h

Vulnerabilities ›

CVE-2026-27656

Medium

Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to properly validate user identity in the OpenID {{IsSameUser()}} comparison logic, which allows an a

CWE-303 — Weakness Type

                    Published: Mar 25, 2026                      ·  Modified: Mar 28, 2026                      ·  Source: NVD                

CVSS v3

5.7

🔗 NVD Official

📄 Description (English)

Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to properly validate user identity in the OpenID {{IsSameUser()}} comparison logic, which allows an attacker to take over arbitrary user accounts via an overly permissive substring matching flaw in the user discovery flow.. Mattermost Advisory ID: MMSA-2026-00590

🤖

Queued for AI Analysis

This CVE will be auto-analyzed on the next cron run.

🔗 References & Sources 1

https://mattermost.com/security-updates

responsibledisclosure@mattermost.com

Vendor Advisory

📦 Affected Products / CPE 4 entries

mattermost:mattermost_server

mattermost:mattermost_server

mattermost:mattermost_server

mattermost:mattermost_server

📊 CVSS Score

5.7

/ 10.0 — Medium

📊 CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:N

Attack VectorN — None / Network

Attack ComplexityH — High

Privileges RequiredH — High

User InteractionR — Required

ScopeU — Unchanged

ConfidentialityH — High

IntegrityH — High

AvailabilityN — None / Network

📋 Quick Facts

Severity Medium

CVSS Score5.7

CWECWE-303

Exploit No

Patch ✗ No

Published 2026-03-25

Source Feed nvd

Views 1

🏷️ Tags

CWE-303

🏢 Vendor Advisories

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

⚡ Actions

🔗 NVD Official Page ⚡ Exploit-DB Search 🐙 GitHub PoC Search 🎯 MITRE ATT&CK 📊 CVE Details

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