GHSA-h469-4fcf-p23h CVE-2025-8402 GO-2025-3911
Mattermost has Potential Server Crash due to Unvalidated Import Data
Medium
Go
- Severity
- 4.9 / 10
- Medium · CVSS 3.1
- Exploit chance (EPSS)
- 0.32%
- Chance of exploitation in the next 30 days. Higher than 25.09% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-476 NULL Pointer Dereference
- Fix
- Available
- 2 packages have a fixed version
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 versions
Go
| Package | Vulnerable | Fixed in |
|---|---|---|
| github.com/mattermost/mattermost-server | >= 10.8.0, < 10.8.4 |
10.8.4 |
| github.com/mattermost/mattermost-server | >= 10.5.0, < 10.5.9 |
10.5.9 |
| github.com/mattermost/mattermost-server | >= 10.9.0, < 10.9.4 |
10.9.4 |
| github.com/mattermost/mattermost-server | >= 10.10.0, < 10.10.1 |
10.10.1 |
| github.com/mattermost/mattermost-server | >= 9.11.0, < 9.11.18 |
9.11.18 |
| github.com/mattermost/mattermost-server | >= 9.11.0+incompatible, < 9.11.18+incompatible>= 10.5.0+incompatible, < 10.5.9+incompatible>= 10.8.0+incompatible, < 10.8.4+incompatible>= 10.9.0+incompatible, < 10.9.4+incompatible>= 10.10.0+incompatible, < 10.10.1+incompatible |
9.11.18+incompatible10.5.9+incompatible10.8.4+incompatible10.9.4+incompatible10.10.1+incompatible |
| github.com/mattermost/mattermost-server/v5 | <= 5.39.3 |
No fix yet |
| github.com/mattermost/mattermost-server/v5 | all versions |
No fix yet |
| github.com/mattermost/mattermost-server/v6 | <= 6.7.2 |
No fix yet |
| github.com/mattermost/mattermost-server/v6 | all versions |
No fix yet |
| github.com/mattermost/mattermost/server/v8 | < 8.0.0-20250708173752-d6b35c41f0ae5 |
8.0.0-20250708173752-d6b35c41f0ae5 |
| github.com/mattermost/mattermost/server/v8 | all versions |
No fix yet |
How to fix
Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.
github.com/mattermost/mattermost-server Go → 10.8.4
- go
go get github.com/mattermost/mattermost-server@v10.8.4 && go mod tidy
github.com/mattermost/mattermost/server/v8 Go → 8.0.0-20250708173752-d6b35c41f0ae5
- go
go get github.com/mattermost/mattermost/server/v8@v8.0.0-20250708173752-d6b35c41f0ae5 && go mod tidy
Severity breakdown
CVSS 3.1 4.9
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Weakness
CWE-476: NULL Pointer Dereference
The product dereferences a pointer that it expects to be valid but is NULL.
How to prevent it
- Implementation: For any pointers that could have been modified or provided from a function that can return NULL, check the pointer for NULL before use. When working with a multithreaded or otherwise asynchronous environment, ensure that proper locking APIs are used to lock before the check, and unlock when it has finished [REF-1484].
- Requirements: Select a programming language that is not susceptible to these issues.
- Implementation: Check the results of all functions that return a value and verify that the value is non-null before acting upon it.
- Architecture and Design: Identify all variables and data stores that receive information from external sources, and apply input validation to make sure that they are only initialized to expected values.
- Implementation: Explicitly initialize all variables and other data stores, either during declaration or just before the first usage.
References
Advisories
Packages
Other links
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-xmfh-3ccg-c9fx Mattermost has an Incorrect Authorization issue | Low | Also affects github.com/mattermost/mattermost-server |
| GHSA-h998-hxxj-8q83 Mattermost doesn't invalidate cached authentication state for active WebSocket connections during global session revocation | Medium | Also affects github.com/mattermost/mattermost-server |
| GHSA-g5vr-6pgg-74qv Mattermost doesn't enforce bot-specific permission checks on the user active status endpoint | Low | Also affects github.com/mattermost/mattermost-server |
| GHSA-jqgv-39mg-7c2r Mattermost doesn't authenticate Atlassian Connect installed callbacks, allowing a remote unauthenticated attacker to inject a rogue sharedSecret | Medium | Also affects github.com/mattermost/mattermost-server |
| GHSA-mxq2-5jpg-7474 Mattermost doesn't validate channel ownership of an existing subscription before applying edits | Medium | Also affects github.com/mattermost/mattermost-server |
| GHSA-2g8v-grq3-hq2g Mattermost doesn't enforce administrator authorization on the {{setDefaultInstance}} call within the {{/gitlab connect}} command handler | Medium | Also affects github.com/mattermost/mattermost-server |
| GHSA-6hxm-w4hv-vgvw Mattermost doesn't require role-management authorization when setting the scheme_admin flag on group syncable link and patch endpoints | High | Also affects github.com/mattermost/mattermost-server |
| GHSA-9p44-r552-4wp9 Mattermost doesn't sanitize the Remote Cluster API response on PATCH operations | Medium | Also affects github.com/mattermost/mattermost-server |
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