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

Source: https://junglewise.ai/threats/cve-2026-3113-mattermost-doesn-t-set-permissions-on-downloaded-bulk-export  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-25  
License: CC BY 4.0 with a link back

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)](https://junglewise.ai/threats/technologies/github-com-mattermost-mattermost-server). Vendors: [Go](https://junglewise.ai/threats/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

  ```sh
  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

## Related threats

- [Mattermost doesn't validate decompressed archive entry sizes during file extraction](https://junglewise.ai/threats/cve-2026-3114-mattermost-doesn-t-validate-decompressed-archive-entry-sizes)
- [Mattermost allows authenticated guest users to enumerate user IDs outside their allowed visibility scope](https://junglewise.ai/threats/cve-2026-3115-mattermost-allows-authenticated-guest-users-to-enumerate-user-ids)
- [GO-2026-5629 - Mattermost doesn't properly validate CSRF tokens in github.com/mattermost/mattermost-server](https://junglewise.ai/threats/cve-2026-27659-mattermost-doesn-t-properly-validate-csrf-tokens)
- [GO-2026-5495 - Mattermost doesn't validate CSRF tokens on an authentication endpoint in github.com/mattermost/mattermost-server](https://junglewise.ai/threats/cve-2026-28741-mattermost-doesn-t-validate-csrf-tokens-on-an-authentication)
- [Mattermost allows attackers to take over arbitrary user accounts via overly permissive substring matching flaw](https://junglewise.ai/threats/cve-2026-27656-mattermost-allows-attackers-to-take-over-arbitrary-user-accounts)