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Vulnerability IntelligenceCVE-2026-3636

CVE-2026-3636

MEDIUM4.3

Sanitize team member data returned by API

Published May 22, 2026

Modified 1 weeks ago

Details

Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to sanitize team member data when returned via API to users without elevated permissions which allows a user without permissions to get data about team members roles via invoking various team API endpoints.. Mattermost Advisory ID: MMSA-2026-00626

References

https://mattermost.com/security-updates

https://www.cve.org/CVERecord?id=CVE-2026-3636

CVSS Analysis

CVSS v3.1

4.3

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Privileges Required

LowPR:L

User Interaction

NoneUI:N

Scope

Scope

UnchangedS:U

Impact

Confidentiality

LowC:L

Integrity

NoneI:N

Availability

NoneA:N

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

Weakness Type (CWE)

Information Disclosure

Information Exposure

Ecosystems

Timeline

PublishedMay 22, 2026

ModifiedMay 22, 2026

CVE-2026-3636 | Mondoo Vulnerability Intelligence