CVE-2026-22892 PUBLISHED

Insufficient Authorization in Mattermost Jira Plugin Allows Unauthorized Access to Post Attachments

Assigner: Mattermost
Reserved: 15.01.2026 Published: 13.02.2026 Updated: 13.02.2026

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

Metrics

CVSS 3.1

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

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	Low
Privileges Required	Low	Integrity Impact	None
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	Mattermost
Product	Mattermost
Versions	Default: unaffected affected from 11.1.0 to 11.1.2 (incl.) affected from 10.11.0 to 10.11.9 (incl.) affected from 11.2.0 to 11.2.1 (incl.) Version 11.3.0 is unaffected Version 11.1.3 is unaffected Version 10.11.10 is unaffected Version 11.2.2 is unaffected

Solutions

Update Mattermost to versions 11.3.0, 11.1.3, 10.11.10, 11.2.2 or higher.

Credits

Juho Forsén finder

References

MMSA-2025-00550

Problem Types

CWE-863: Incorrect Authorization CWE