Medium severity · published Feb 13, 2026
CVE-2026-22892
Insufficient Authorization in Mattermost Jira Plugin Allows Unauthorized Access to Post Attachments
4.3
CVSS
0.3%
EPSS
No
On KEV
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
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 19% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MA
Mattermost · Mattermost
11.1.0 through 11.1.2; 10.11.0 through 10.11.9; 11.2.0 through 11.2.1 · source: vendor
MS
Mattermost Server · Mattermost
10.11.0 before 10.11.10; 11.0.0 before 11.1.3; 11.2.0 before 11.2.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-22892
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-22892
Vendor Advisory
https://mattermost.com/security-updates
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