CVE-2026-22892— Insufficient Authorization in Mattermost Jira Plugin Allows Unauthorized Access to Post Attachments
Quick assessment
Affected
Mattermost Mattermost
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Mattermost是美国Mattermost公司的一个开源协作平台。 Mattermost 11.1.2及之前的11.1.x版本、10.11.9及之前的10.11.x版本和11.2.1及之前的11.2.x版本存在安全漏洞，该漏洞源于从Mattermost帖子创建Jira问题时未验证用户权限，可能导致经过身份验证的攻击者读取其无法访问的频道中的帖子内容和附件。
Possible ATT&CK Techniques 1 AI
T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2026-22892
Vulnerability Information
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Vulnerability Title
Insufficient Authorization in Mattermost Jira Plugin Allows Unauthorized Access to Post Attachments
Source: CVE Program / CVE List V5
Vulnerability Description
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
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Mattermost 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mattermost是美国Mattermost公司的一个开源协作平台。 Mattermost 11.1.2及之前的11.1.x版本、10.11.9及之前的10.11.x版本和11.2.1及之前的11.2.x版本存在安全漏洞，该漏洞源于从Mattermost帖子创建Jira问题时未验证用户权限，可能导致经过身份验证的攻击者读取其无法访问的频道中的帖子内容和附件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Mattermost | Mattermost | 11.1.0 ~ 11.1.2 | - |
|
II. Public POCs for CVE-2026-22892
| # | POC Description | Source Link | Shenlong Link |
|---|
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V. Comments for CVE-2026-22892
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