CVE-2024-23838

TrueLayer.Client SSRF when fetching payment or payment provider

Workarounds

The issue can be mitigated by having strict egress rules limiting the destinations to which requests can be made, and applying strict validation to any user input passed to the TrueLayer.Client library.

The vulnerability could potentially allow a malicious actor to gain control over the destination URL of the HttpClient used in the API classes. For applications using the SDK, requests to unexpected resources on local networks or to the internet could be made which could lead to information disclosure.

Untrusted input controls the target URL of a server-initiated request, which may reach internal services not otherwise accessible from outside. Typical impact: access to internal metadata services, internal APIs, or cloud credentials.

CVE-2024-23838 has a CVSS score of 8.6 (High). The vector is network-reachable, no 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 (1.6.0); upgrading removes the vulnerable code path.

Kodem intelligence

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Versions of TrueLayer.Client v1.6.0 and later are not affected.

1. What is CVE-2024-23838? CVE-2024-23838 is a high-severity server-side request forgery (SSRF) vulnerability in TrueLayer.Client (nuget), affecting versions < 1.6.0. It is fixed in 1.6.0. Untrusted input controls the target URL of a server-initiated request, which may reach internal services not otherwise accessible from outside.
2. How severe is CVE-2024-23838? CVE-2024-23838 has a CVSS score of 8.6 (High). 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 TrueLayer.Client are affected by CVE-2024-23838? TrueLayer.Client (nuget) versions < 1.6.0 is affected.
4. Is there a fix for CVE-2024-23838? Yes. CVE-2024-23838 is fixed in 1.6.0. Upgrade to this version or later.
5. Is CVE-2024-23838 exploitable, and should I be worried? Whether CVE-2024-23838 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-2024-23838 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-2024-23838? Upgrade TrueLayer.Client to 1.6.0 or later.