Vulnerability · Published Nov 18, 2025 · Assigned by Mattermost
CVE-2025-55074Channel member objects leak read status
Low 3.0
In plain English
A low-severity security flaw in Mattermost from Mattermost. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)3.0Low
Exploit odds (30 days)0.2%top 92.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11 fail to enforce access permissions on the Agents plugin which allows other users to determine when users had read channels via channel member objects
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/mattermost/mattermost-server | 10.11.4+incompatible, 10.5.12+incompatible | GO-2025-4133 |
| Go | github.com/mattermost/mattermost-server | 10.5.12 | GHSA-9hh7-6558-qfp2 |
| Go | github.com/mattermost/mattermost-server | 10.11.4 | GHSA-9hh7-6558-qfp2 |
| Go | github.com/mattermost/mattermost-server/v5 | no fix listed | GO-2025-4133 |
| Go | github.com/mattermost/mattermost-server/v6 | no fix listed | GO-2025-4133 |
| Go | github.com/mattermost/mattermost/server/v8 | no fix listed | GO-2025-4133 |
| Go | github.com/mattermost/mattermost/server/v8 | 8.0.0-20250905150616-ba86dfc5876b6 | GHSA-9hh7-6558-qfp2 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost | 10.11.0 – through 10.11.310.5.0 – through 10.5.11 |
Weakness: CWE-1426 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:N/A:N