CVE-2023-4105
Attachment of deleted message in a thread remains accessible and downloadable
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
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Attachment of deleted message in a thread remains accessible and downloadable
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
- Record
CVE-2023-4105- CVSS 3.1
- 3.1 Low
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N - Weakness
- CWE-862
- Updated
- 2026-11-02
EUVDEUVD-2023-2285
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
- Record
EUVD-2023-2285- CVSS 3.1
- 3.1 Low
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-g3v6-r8p9-wxg9
Mattermost fails to correctly delete attachments
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
- Record
GHSA-g3v6-r8p9-wxg9- CVSS 3.1
- 3.1 Low
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N - Weakness
- CWE-284, CWE-862
- Updated
- 2026-11-02
NVD
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
- Record
CVE-2023-4105- CVSS 3.1
- 3.1 Low
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N - CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N - Weakness
- CWE-862
- Updated
- 2026-11-02
OSV
Attachment of deleted message in a thread remains accessible and downloadable
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
- Record
CVE-2023-4105- CVSS 3.1
- 3.1 Low
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N - Weakness
- CWE-862
- Updated
- 2026-11-02
OSVGHSA-g3v6-r8p9-wxg9
Mattermost fails to correctly delete attachments
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
- Record
GHSA-g3v6-r8p9-wxg9- CVSS 3.1
- 3.1 Low
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N - Weakness
- CWE-284, CWE-862
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
github.com/mattermost/mattermost-server/v6Go |
7.9.0 to 7.9.5 | 7.9.6 |
github.com/mattermost/mattermost-server/v6Go |
7.10.0 to 7.10.3 | 7.10.4 |
github.com/mattermost/mattermost-server/v6Go |
through 7.8.7 | 7.8.8 |
github.com/mattermost/mattermost-server/v6Go |
7.9.0 up to 7.9.6 | 7.9.6 |
github.com/mattermost/mattermost-server/v6Go |
7.10.0 up to 7.10.4 | 7.10.4 |
github.com/mattermost/mattermost-server/v6Go |
before 7.8.8 | 7.8.8 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2023-4105 is a low vulnerability (CVSS 3.1) in Mattermost, published August 11, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.40%, the 34th percentile. Fixed in github.com/mattermost/mattermost-server/v6 7.9.6.