Mattermost is vulnerable to DoS due to infinite re-renders on API errorsGHSA-mx8m-v8qm-xwr8
MEDIUMFix: mattermost/mattermost@613bb61GHSA-mx8m-v8qm-xwr8 is a medium-severity (CVSS 6.8) CWE-770 vulnerability in github.com/mattermost/mattermost-server. A fix is available for github.com/mattermost/mattermost-server — see the affected versions and patch details below.
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for GHSA-mx8m-v8qm-xwr8.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
github.com/mattermost/mattermost-server🐹github.com/mattermost/mattermost-server🐹github.com/mattermost/mattermost-serverReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.
Description
Mattermost versions 10.11.x <= 10.11.8, 11.1.x <= 11.1.1, 11.0.x <= 11.0.6 fail to prevent infinite re-renders on API errors which allows authenticated users to cause application-level DoS via triggering unbounded component re-render loops.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | github.com/mattermost/mattermost-server | ≥ 10.11.0&&< 10.11.9 | 10.11.9go get github.com/mattermost/mattermost-server@v10.11.9 |
| 🐹Go | github.com/mattermost/mattermost-server | ≥ 11.1.0&&< 11.1.2 | 11.1.2go get github.com/mattermost/mattermost-server@v11.1.2 |
| 🐹Go | github.com/mattermost/mattermost-server | ≥ 11.0.0&&< 11.0.7 | 11.0.7go get github.com/mattermost/mattermost-server@v11.0.7 |
Affected Products
mattermost servermattermostDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/mattermost/mattermost-server, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/mattermost/mattermost-server to 10.11.9 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-mx8m-v8qm-xwr8 is resolved across your whole dependency graph.
Workarounds
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.
Frequently Asked Questions
Is GHSA-mx8m-v8qm-xwr8 in your dependencies?
Find it across Go, including transitive dependencies.