CVE-2023-3581
WebSockets accept connections from HTTPS origin
Mattermost fails to properly validate the origin of a websocket connection allowing a MITM attacker on Mattermost to access the websocket APIs.
Attack profile
How easy it is to exploit
- Attack vector
- Physical
- Complexity
- Low
- Privileges needed
- High
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
WebSockets accept connections from HTTPS origin
Mattermost fails to properly validate the origin of a websocket connection allowing a MITM attacker on Mattermost to access the websocket APIs.
- Record
CVE-2023-3581- CVSS 3.1
- 6.2 Medium
CVSS:3.1/AV:P/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-346
- Updated
- 2026-11-02
EUVDEUVD-2023-44231
Mattermost fails to properly validate the origin of a websocket connection allowing a MITM attacker on Mattermost to access the websocket APIs.
- Record
EUVD-2023-44231- CVSS 3.1
- 6.2 Medium
CVSS:3.1/AV:P/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-5g2h-c436-5ppg
Mattermost fails to properly validate the origin of a websocket connection allowing a MITM...
Mattermost fails to properly validate the origin of a websocket connection allowing a MITM attacker on Mattermost to access the websocket APIs.
- Record
GHSA-5g2h-c436-5ppg- CVSS 3.1
- 6.2 Medium
CVSS:3.1/AV:P/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-346
- Updated
- 2026-11-02
NVD
Mattermost fails to properly validate the origin of a websocket connection allowing a MITM attacker on Mattermost to access the websocket APIs.
- Record
CVE-2023-3581- CVSS 3.1
- 6.2 Medium
CVSS:3.1/AV:P/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-346
- Updated
- 2026-11-02
OSV
WebSockets accept connections from HTTPS origin
Mattermost fails to properly validate the origin of a websocket connection allowing a MITM attacker on Mattermost to access the websocket APIs.
- Record
CVE-2023-3581- CVSS 3.1
- 6.2 Medium
CVSS:3.1/AV:P/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-346
- Updated
- 2026-11-02
OSVBIT-mattermost-2023-3581 No score
Mattermost fails to properly validate the origin of a websocket connection allowing a MITM attacker on Mattermost to access the websocket APIs.
- Record
BIT-mattermost-2023-3581- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
mattermostBitnami |
7.8.0 up to 7.8.7, 7.9.0 up to 7.9.5, 7.10.0 up to 7.10.3 | 7.8.77.9.57.10.3 |
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-2023-3581 is a medium vulnerability (CVSS 6.2) in Mattermost, published July 17, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.26%, the 18th percentile. Fixed in mattermost 7.8.7.