Vulnerability · Published Jun 22, 2026 · Assigned by Mattermost
CVE-2026-6062IDOR in Jira plugin subscription edit endpoint
Medium 6.4
In plain English
A medium-severity authorization bypass via user-controlled key in Mattermost from Mattermost. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 Fail to validate channel ownership of an existing subscription before applying edits which allows an authenticated attacker to hijack subscriptions from channels they have no access to via a crafted PUT request to the subscription edit endpoint.. Mattermost Advisory ID: MMSA-2026-00650
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/mattermost/mattermost-server | 11.7.1 | GHSA-mxq2-5jpg-7474 |
| Go | github.com/mattermost/mattermost-server | 11.6.3 | GHSA-mxq2-5jpg-7474 |
| Go | github.com/mattermost/mattermost-server | 11.5.6 | GHSA-mxq2-5jpg-7474 |
| Go | github.com/mattermost/mattermost-server | 10.11.18 | GHSA-mxq2-5jpg-7474 |
| Go | github.com/mattermost/mattermost-server | 10.11.18+incompatible, 11.5.6+incompatible, 11.6.3+incompatible, 11.7.1+incompatible | GO-2026-6484 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost | 11.7.0 – through 11.7.011.6.0 – through 11.6.211.5.0 – through 11.5.510.11.0 – through 10.11.17 |
Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:L
References
- MMSA-2026-00650 vendor-advisory