Summary
Mattermost does not strip embeds from metadata when broadcasting posted events.
This allows users to include arbitrary embeds in posts, which are then broadcasted via websockets. This can be exploited in many ways, for example to create permalinks with fully customizable content or to trigger a client Side Denial of Service (DoS) by sending a permalink with a non-string message.
The advisory metadata references the appropriate go pseudo version available from pkg.go.dev
Impact
Crafted input forces the application to consume excessive CPU, memory, or other resources, degrading or denying service. Typical impact: denial of service.
CVE-2024-47003 has a CVSS score of 5.4 (Medium). The vector is network-reachable, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (8.0.0-20240806094731-69a8b3df0f9f); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
Remediation advice
Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
Frequently Asked Questions
- What is CVE-2024-47003? CVE-2024-47003 is a medium-severity uncontrolled resource consumption vulnerability in github.com/mattermost/mattermost/server/v8 (go), affecting versions < 8.0.0-20240806094731-69a8b3df0f9f. It is fixed in 8.0.0-20240806094731-69a8b3df0f9f. Crafted input forces the application to consume excessive CPU, memory, or other resources, degrading or denying service.
- How severe is CVE-2024-47003? CVE-2024-47003 has a CVSS score of 5.4 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which versions of github.com/mattermost/mattermost/server/v8 are affected by CVE-2024-47003? github.com/mattermost/mattermost/server/v8 (go) versions < 8.0.0-20240806094731-69a8b3df0f9f is affected.
- Is there a fix for CVE-2024-47003? Yes. CVE-2024-47003 is fixed in 8.0.0-20240806094731-69a8b3df0f9f. Upgrade to this version or later.
- Is CVE-2024-47003 exploitable, and should I be worried? Whether CVE-2024-47003 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2024-47003 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2024-47003? Upgrade
github.com/mattermost/mattermost/server/v8to 8.0.0-20240806094731-69a8b3df0f9f or later.