Vulnerability · Published Aug 21, 2025 · Assigned by Mattermost
CVE-2025-8402Nil pointer dereference in bulk import crashes server
Medium 4.9
In plain English
A medium-severity null pointer dereference 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 0.3% (higher than 25% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)4.9Medium
Exploit odds (30 days)0.3%top 74.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.10.x <= 10.10.0, 10.9.x <= 10.9.3 fail to validate import data which allows a system admin to crash the server via the bulk import feature.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/mattermost/mattermost-server | 10.8.4 | GHSA-h469-4fcf-p23h |
| Go | github.com/mattermost/mattermost-server | 10.5.9 | GHSA-h469-4fcf-p23h |
| Go | github.com/mattermost/mattermost-server | 10.9.4 | GHSA-h469-4fcf-p23h |
| Go | github.com/mattermost/mattermost-server | 10.10.1 | GHSA-h469-4fcf-p23h |
| Go | github.com/mattermost/mattermost-server | 10.10.1+incompatible, 10.5.9+incompatible, 10.8.4+incompatible, 10.9.4+incompatible, 9.11.18+incompatible | GO-2025-3911 |
| Go | github.com/mattermost/mattermost-server | 9.11.18 | GHSA-h469-4fcf-p23h |
| Go | github.com/mattermost/mattermost-server/v5 | no fix listed | GHSA-h469-4fcf-p23h |
| Go | github.com/mattermost/mattermost-server/v5 | no fix listed | GO-2025-3911 |
| Go | github.com/mattermost/mattermost-server/v6 | no fix listed | GO-2025-3911 |
| Go | github.com/mattermost/mattermost-server/v6 | no fix listed | GHSA-h469-4fcf-p23h |
| Go | github.com/mattermost/mattermost/server/v8 | 8.0.0-20250708173752-d6b35c41f0ae5 | GHSA-h469-4fcf-p23h |
| Go | github.com/mattermost/mattermost/server/v8 | no fix listed | GO-2025-3911 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost | 10.8.0 – through 10.8.310.5.0 – through 10.5.89.11.0 – through 9.11.1710.10.010.9.0 – through 10.9.3 |
Weakness: CWE-1287, CWE-476 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H