CVE-2023-43661

Cachet vulnerable to Authenticated Remote Code Execution

Server-side template injection is when an attacker is able to use native template syntax to inject a malicious payload into a template, which is then executed server-side. Template engines are designed to generate web pages by combining fixed templates with volatile data. Server-side template injection attacks can occur when user input is concatenated directly into a template, rather than passed in as data. This allows attackers to inject arbitrary template directives in order to manipulate the template engine, often enabling them to take complete control of the server. As the name suggests, server-side template injection payloads are delivered and evaluated server-side, potentially making them more dangerous than a typical client-side template injection.

Untrusted input is evaluated as executable code within the application's runtime environment. Typical impact: arbitrary code execution within the application's privilege context.

CVE-2023-43661 has a CVSS score of 9.1 (Critical). 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 (2.4); upgrading removes the vulnerable code path.

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1. What is CVE-2023-43661? CVE-2023-43661 is a critical-severity code injection vulnerability in cachethq/cachet (composer), affecting versions < 2.4. It is fixed in 2.4. Untrusted input is evaluated as executable code within the application's runtime environment.
2. How severe is CVE-2023-43661? CVE-2023-43661 has a CVSS score of 9.1 (Critical). 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.
3. Which versions of cachethq/cachet are affected by CVE-2023-43661? cachethq/cachet (composer) versions < 2.4 is affected.
4. Is there a fix for CVE-2023-43661? Yes. CVE-2023-43661 is fixed in 2.4. Upgrade to this version or later.
5. Is CVE-2023-43661 exploitable, and should I be worried? Whether CVE-2023-43661 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
6. What actually determines whether CVE-2023-43661 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.
7. How do I fix CVE-2023-43661? Upgrade cachethq/cachet to 2.4 or later.

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