Vulnerability · Published Mar 26, 2026 · Assigned by Mattermost
CVE-2026-3113mmctl export download command doesn’t restrict permissions to created file to file owner
Medium 5.0
In plain English
A medium-severity incorrect permission assignment 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 0.1% (higher than 3% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.0Medium
Exploit odds (30 days)0.1%top 97.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to set permissions on downloaded bulk export which allows other local users on the server to be able to read contents of the bulk export.. Mattermost Advisory ID: MMSA-2026-00593
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/mattermost/mattermost-server | 11.4.1 | GHSA-4765-v66x-rqx7 |
| Go | github.com/mattermost/mattermost-server | 11.3.2 | GHSA-4765-v66x-rqx7 |
| Go | github.com/mattermost/mattermost-server | 11.2.4 | GHSA-4765-v66x-rqx7 |
| Go | github.com/mattermost/mattermost-server | 10.11.12 | GHSA-4765-v66x-rqx7 |
| Go | github.com/mattermost/mattermost-server | 8.0.0-20260217110922-b7d4a1f1f59b | GHSA-4765-v66x-rqx7 |
| Go | github.com/mattermost/mattermost-server | 10.11.12+incompatible, 11.2.4+incompatible, 11.3.2+incompatible, 11.4.1+incompatible | GO-2026-5112 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost | 11.4.0 – through 11.4.011.3.0 – through 11.3.111.2.0 – through 11.2.310.11.0 – through 10.11.11 |
Weakness: CWE-732 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
References
- MMSA-2026-00593 vendor-advisory