CVE-2023-1777
Information disclosure in linked message previews
Mattermost allows an attacker to request a preview of an existing message when creating a new message via the createPost API call, disclosing the contents of the linked message.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Information disclosure in linked message previews
Mattermost allows an attacker to request a preview of an existing message when creating a new message via the createPost API call, disclosing the contents of the linked message.
- Record
CVE-2023-1777- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-200
- Updated
- 2026-11-02
EUVDEUVD-2023-0855
Mattermost allows an attacker to request a preview of an existing message when creating a new message via the createPost API call, disclosing the contents of the linked message.
- Record
EUVD-2023-0855- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-3wq5-3f56-v5xc
Mattermost vulnerable to information disclosure
Mattermost allows an attacker to request a preview of an existing message when creating a new message via the createPost API call, disclosing the contents of the linked message.
- Record
GHSA-3wq5-3f56-v5xc- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N - Weakness
- CWE-668
- Updated
- 2026-11-02
NVD
Mattermost allows an attacker to request a preview of an existing message when creating a new message via the createPost API call, disclosing the contents of the linked message.
- Record
CVE-2023-1777- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N - Weakness
- CWE-200, CWE-668
- Updated
- 2026-11-02
OSV
Information disclosure in linked message previews
Mattermost allows an attacker to request a preview of an existing message when creating a new message via the createPost API call, disclosing the contents of the linked message.
- Record
CVE-2023-1777- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-200
- Updated
- 2026-11-02
OSVGHSA-3wq5-3f56-v5xc
Mattermost vulnerable to information disclosure
Mattermost allows an attacker to request a preview of an existing message when creating a new message via the createPost API call, disclosing the contents of the linked message.
- Record
GHSA-3wq5-3f56-v5xc- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N - Weakness
- CWE-668
- Updated
- 2026-11-02
OSVBIT-mattermost-2023-1777 No score
Mattermost allows an attacker to request a preview of an existing message when creating a new message via the createPost API call, disclosing the contents of the linked message.
- Record
BIT-mattermost-2023-1777- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
github.com/mattermost/mattermost-server/v6Go |
6.3.0 to 6.7.2 | 7.1.6 |
github.com/mattermost/mattermost-serverGo |
7.8.0 to 7.8.0 | 7.8.1 |
github.com/mattermost/mattermost-serverGo |
7.7.0 to 7.7.1 | 7.7.2 |
github.com/mattermost/mattermost-serverGo |
7.1.0 to 7.1.5 | 7.1.6 |
github.com/mattermost/mattermost-server/v6Go |
6.0.0-20211025164829-f7a8147b825c up to 6.0.0-20230301145909-10be118d99a5 | 6.0.0-20230301145909-10be118d99a5 |
github.com/mattermost/mattermost-serverGo |
1.4.1-0.20211025164829-f7a8147b825c up to 1.4.1-0.20230301145909-10be118d99a5 | 1.4.1-0.20230301145909-10be118d99a5 |
mattermostBitnami |
before 7.1.6, 7.7.1 to 7.7.1, 7.8.0 to 7.8.0 | 7.1.6 |
github.com/mattermost/mattermost-server/v6Go |
6.3.0 up to 7.1.6 | 7.1.6 |
github.com/mattermost/mattermost-serverGo |
7.8.0 up to 7.8.1 | 7.8.1 |
github.com/mattermost/mattermost-serverGo |
7.7.0 up to 7.7.2 | 7.7.2 |
github.com/mattermost/mattermost-serverGo |
7.1.0 up to 7.1.6 | 7.1.6 |
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-2023-1777 is a medium vulnerability (CVSS 6.5) in Mattermost, published March 31, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.54%, the 45th percentile. Fixed in github.com/mattermost/mattermost-server/v6 7.1.6.