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Low, CVSS 3.1

Mattermost fails to correctly delete attachments

CVE-2023-4105GHSA-g3v6-r8p9-wxg9

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (github.com/mattermost/mattermost-server/v6 7.10.4, 7.9.6, 7.8.8), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
3.1 · CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
EPSS
  • CVE-2023-4105: 0.40% estimated exploitation activity in the next 30 days; percentile 34.24 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Mattermost fails to delete the attachments when deleting a message in a thread allowing a simple user to still be able to access and download the attachment of a deleted message

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-g3v6-r8p9-wxg9

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2023-4105

Advisory: Mattermost fails to correctly delete attachments
IDs: CVE-2023-4105, GHSA-g3v6-r8p9-wxg9
Record: https://patchnext.com/advisories/cve-2023-4105 (revision 1, source checked 26 Oct 2026, 15:00 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Low (CVSS 3.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/mattermost/mattermost-server/v6 7.10.4, 7.9.6, 7.8.8. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/mattermost/mattermost-server/v6: affected >= 7.9.0, <= 7.9.5; >= 7.10.0, <= 7.10.3; <= 7.8.7; fixed in 7.8.8, 7.9.6, 7.10.4

## Suggested inspection (read-only)
- Go github.com/mattermost/mattermost-server/v6: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/mattermost/mattermost-server/v6.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-g3v6-r8p9-wxg9 (GitHub-reviewed advisory GHSA-g3v6-r8p9-wxg9 lists affected ranges: Go github.com/mattermost/mattermost-server/v6 >=7.9.0 =7.10.0 =0 <=7.8.7)

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