Skip to main content

Mondoo

Vulnerability Management
Technology
Services

Solutions

Financial Services
Manufacturing
Healthcare

Resources

Blog
Vulnerability Database
Documentation
GitHub

Company

About
Careers
Partners
Contact

Legal

Privacy
Terms
Imprint

© 2026 Mondoo, Inc.

Log in Get Assessment

Vulnerability IntelligenceCVE-2026-3524

CVE-2026-3524

HIGH8.8

Authorization Bypass in Mattermost Legal Hold Plugin Due to Missing Return After Permission Check

Published Apr 6, 2026

Modified 3 weeks ago

Details

Mattermost Plugin Legal Hold versions <=1.1.4 fail to halt request processing after a failed authorization check in ServeHTTP which allows an authenticated attacker to access, create, download, and delete legal hold data via crafted API requests to the plugin's endpoints. Mattermost Advisory ID: MMSA-2026-00621

References

https://mattermost.com/security-updates

https://www.cve.org/CVERecord?id=CVE-2026-3524

CVSS Analysis

CVSS v3.1

8.3

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Privileges Required

LowPR:L

User Interaction

NoneUI:N

Scope

Scope

UnchangedS:U

Impact

Confidentiality

HighC:H

Integrity

HighI:H

Availability

HighA:H

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

Weakness Type (CWE)

Access Control

Missing Authorization

Ecosystems

Timeline

PublishedApr 6, 2026

ModifiedApr 7, 2026

CVE-2026-3524 | Mondoo Vulnerability Intelligence