PT-2026-28422 · Mattermost · Mattermost

Winfunc · CVE-2026-3113 · Published 2026-03-26 · Updated 2026-06-25

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Name of the Vulnerable Software and Affected Versions Mattermost versions 10.11.x through 10.11.11 Mattermost versions 11.2.x through 11.2.3 Mattermost versions 11.3.x through 11.3.1 Mattermost versions 11.4.x through 11.4.0

Description The software fails to properly set permissions on downloaded bulk exports. This allows other local users on the server to read the contents of the exported data.

Recommendations Update Mattermost versions prior to 10.11.12. Update Mattermost versions prior to 11.2.4. Update Mattermost versions prior to 11.3.2. Update Mattermost versions prior to 11.4.1.

Exploit

Fix

DoS

Incorrect Permission

Weakness Enumeration

CWE-732

Related Identifiers

CVE-2026-3113

GHSA-4765-V66X-RQX7

GO-2026-5112

Affected Products

Mattermost

References · 9

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3113.json · Exploit
• https://mattermost.com/security-updates · Vendor Advisory
• https://osv.dev/vulnerability/GO-2026-5112 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-3113 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-3113 · Security Note
• https://osv.dev/vulnerability/GHSA-4765-v66x-rqx7 · Vendor Advisory
• https://github.com/mattermost/mattermost · Note
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-3113 · Note
• https://github.com/advisories/GHSA-4765-v66x-rqx7 · Note