CVE-2023-48732
Keywords that trigger mentions are leaked to other users
CVE-2023-48732 is a medium vulnerability (CVSS 4.3) in Mattermost, published January 2, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.46%, the 40th percentile. Fixed in github.com/mattermost/mattermost/server/v8 8.1.7.
- Severity
- 4.3 MediumCVSS 3.1, CVE List
- Exploit chance
- 0.46%EPSS, 40th percentile
- Exploitation
- None knownNot on CISA’s or ENISA’s lists
- Fixed in
8.1.7github.com/mattermost/mattermost/server/v8 +8 more
Description
Mattermost fails to scope the WebSocket response around notified users to a each user separately resulting in the WebSocket broadcasting the information about who was notified about a post to everyone else in the channel.
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
- Low
- Integrity
- None
- Availability
- None
Exploit likelihood
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
github.com/mattermost/mattermost/server/v8Go | through 8.1.6 | 8.1.7 |
github.com/mattermost/mattermost-server/v6Go | through 8.1.6 | 8.1.7 |
mattermostBitnami | before 8.1.7 | 8.1.7 |
github.com/mattermost/mattermost/server/v8Go | before 8.1.7 | 8.1.7 |
github.com/mattermost/mattermost-server/v6Go | before 8.1.7 | 8.1.7 |
github.com/mattermost/mattermost-serverGo | before 8.1.7+incompatible | 8.1.7+incompatible |
github.com/mattermost/mattermost-server/v5Go | All versions | None known |
github.com/mattermost/mattermost-server/v6Go | All versions | None known |
github.com/mattermost/mattermost/server/v8Go | All versions | None known |
What each source reports
CVE List Score used
Keywords that trigger mentions are leaked to other users
Mattermost fails to scope the WebSocket response around notified users to a each user separately resulting in the WebSocket broadcasting the information about who was notified about a post to everyone else in the channel.
- Record
CVE-2023-48732- 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-200
- Updated
- 2026-11-02
EUVDEUVD-2024-0399
Mattermost fails to scope the WebSocket response around notified users to a each user separately resulting in the WebSocket broadcasting the information about who was notified about a post to everyone else in the channel.
- Record
EUVD-2024-0399- 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 - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-q7rx-w656-fwmv
Mattermost notified all users in the channel when using WebSockets to respond individually
Mattermost fails to scope the WebSocket response around notified users to a each user separately resulting in the WebSocket broadcasting the information about who was notified about a post to everyone else in the channel.
- Record
GHSA-q7rx-w656-fwmv- CVSS 4.0
- 5.3 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA: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-200
- Updated
- 2026-11-02
NVD
Mattermost fails to scope the WebSocket response around notified users to a each user separately resulting in the WebSocket broadcasting the information about who was notified about a post to everyone else in the channel.
- Record
CVE-2023-48732- 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-200
- Updated
- 2026-11-02
OSV
Keywords that trigger mentions are leaked to other users
Mattermost fails to scope the WebSocket response around notified users to a each user separately resulting in the WebSocket broadcasting the information about who was notified about a post to everyone else in the channel.
- Record
CVE-2023-48732- 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-200
- Updated
- 2026-11-02
OSVGHSA-q7rx-w656-fwmv
Mattermost notified all users in the channel when using WebSockets to respond individually
Mattermost fails to scope the WebSocket response around notified users to a each user separately resulting in the WebSocket broadcasting the information about who was notified about a post to everyone else in the channel.
- Record
GHSA-q7rx-w656-fwmv- CVSS 4.0
- 5.3 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA: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-200
- Updated
- 2026-11-02
OSVBIT-mattermost-2023-48732No score
Mattermost fails to scope the WebSocket response around notified users to a each user separately resulting in the WebSocket broadcasting the information about who was notified about a post to everyone else in the channel.
- Record
BIT-mattermost-2023-48732- Updated
- 2026-11-02
OSVGO-2024-2448No score
Mattermost notified all users in the channel when using WebSockets to respond individually in github.com/mattermost/mattermost-server
Mattermost notified all users in the channel when using WebSockets to respond individually in github.com/mattermost/mattermost-server.
NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions.
(If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.)
The additional affected modules and versions are: github.com/mattermost/mattermost/server/v8 before v8.1.7.
- Record
GO-2024-2448- Updated
- 2026-11-02
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
References
mattermost.com/security-updates
nvd.nist.gov/vuln/detail/CVE-2023-48732
github.com/mattermost/mattermost/commit/851515be222160bee0a495c0d411056b19ed4111