CVE-2026-3113: GO-2026-5112 - Mattermost doesn't set permissions on downloaded bulk export in github.com/mattermost/mattermost-server

CVE-2026-3113 · Severity: low · CVSS 3.1 · Published 2026-06-25

Mattermost doesn't set permissions on downloaded bulk export in github.com/mattermost/mattermost-server

Technologies: github.com/mattermost/mattermost-server (Go). Vendors: Go.

Quick answers

Is CVE-2026-3113 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-3113 being exploited in the wild.
How severe is CVE-2026-3113?
Low severity, with a CVSS score of 3.1, published 25 June 2026.
Which products and versions are affected?
github.com/mattermost/mattermost-server (Go) SEMVER:introduced=10.11.0-rc1+incompatible,fixed=10.11.12+incompatible,introduced=11.2.0-rc1+incompatible,fixed=11.2.4+incompatible,introduced=11.3.0-rc1+incompatible,fixed=11.3.2+incompatible,introduced=11.4.0-rc1+incompatible,fixed=11.4.1+incompatible, SEMVER:introduced=11.4.0-rc1,fixed=11.4.1.
Is there a fix for CVE-2026-3113?
Yes. github.com/mattermost/mattermost-server (Go): upgrade to 11.4.1, 11.4.1+incompatible or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-3113?
Check whether you run github.com/mattermost/mattermost-server (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • github.com/mattermost/mattermost-server (Go): upgrade to 11.4.1, 11.4.1+incompatible or later
    go get github.com/mattermost/mattermost-server@v11.4.1+incompatible

Affected products

  • github.com/mattermost/mattermost-server (Go) SEMVER:introduced=10.11.0-rc1+incompatible,fixed=10.11.12+incompatible,introduced=11.2.0-rc1+incompatible,fixed=11.2.4+incompatible,introduced=11.3.0-rc1+incompatible,fixed=11.3.2+incompatible,introduced=11.4.0-rc1+incompatible,fixed=11.4.1+incompatible, SEMVER:introduced=11.4.0-rc1,fixed=11.4.1

Identifiers

  • CVE-2026-3113
  • GHSA-4765-v66x-rqx7
  • GO-2026-5112

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