CVE-2025-64641
MEDIUM4.1EPSS 0.03%Mattermost doesn't verify that post actions invoking `/share-issue-publicly` were created by the Jira plugin
Published: 12/24/2025Modified: 2/27/2026
Description
Mattermost versions 11.1.x <= 11.1.0, 11.0.x <= 11.0.5, 10.12.x <= 10.12.3, 10.11.x <= 10.11.7 fail to verify that post actions invoking /share-issue-publicly were created by the Jira plugin which allowed a malicious Mattermost user to exfiltrate Jira tickets when victim users interacted with affected posts
Affected packages (6)
- Go/github.com/mattermost/mattermost-server>= 10.11.0, < 10.11.8
- Go/github.com/mattermost/mattermost-server>= 10.11.0+incompatible, < 10.11.8+incompatible, >= 10.12.0+incompatible, < 10.12.4+incompatible, >= 11.0.1+incompatible, < 11.0.6+incompatible, >= 11.1.0+incompatible, < 11.1.1+incompatible
- Go/github.com/mattermost/mattermost-server/v5from 0
- Go/github.com/mattermost/mattermost-server/v6from 0
- Go/github.com/mattermost/mattermost/server/v8from 0, < 8.0.0-20251121122154-b57c297c6d7
- Go/github.com/mattermost/mattermost/server/v8from 0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM4.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N |
References (7)
- ADVISORYhttps://github.com/advisories/GHSA-vww6-79rv-3j4x
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2025-64641
- PATCHhttps://github.com/mattermost/mattermost
- WEBhttps://github.com/mattermost/mattermost/commit/b57c297c6d7ae6812d85e32a625806ac9555deee
- WEBhttps://github.com/mattermost/mattermost/pull/34551
- WEBhttps://mattermost.com/security-updates
- WEBhttps://pkg.go.dev/vuln/GO-2026-4260