CVE-2026-22892 MEDIUM

CVE-2026-22892: Insufficient Authorization in Mattermost Jira Plugin Allows Unauthorized Access to Post Attachments

Vendor Mattermost
Product Mattermost
Weakness CWE-863 · Incorrect authorization
Published February 13, 2026
Last update February 13, 2026
View on NVD All CVEs

CVSS base score

4.3/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality Low
Integrity None

CVSS vector

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

What the vulnerability does

01Description

Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to validate user permissions when creating Jira issues from Mattermost posts, which allows an authenticated attacker with access to the Jira plugin to read post content and attachments from channels they do not have access to via the /create-issue API endpoint by providing the post ID of an inaccessible post.. Mattermost Advisory ID: MMSA-2025-00550

Key dates

02Disclosure timeline

February 13, 2026 CVE published
February 13, 2026 Record updated