What’s Vulnerable › Vulnerabilities

CVE-2024-23838: TrueLayer.Client SSRF when fetching payment or payment provider

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-01-30 · updated 2026-06-17
• Weakness: CWE-918

Description

TrueLayer.NET is the .Net client for TrueLayer. 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. 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-dotnet` library. Versions of TrueLayer.Client `v1.6.0` and later are not affected.

Affected products

• truelayer-dotnet: before 1.6.0 — fixed in 1.6.0

How to fix

Upgrade to a fixed version: truelayer-dotnet 1.6.0. Check the vendor advisory for mitigations.

References

• https://github.com/TrueLayer/truelayer-dotnet/commit/75e436ed5360faa73d6e7ce3a9903a3c49505e3e
• https://github.com/TrueLayer/truelayer-dotnet/security/advisories/GHSA-67m4-qxp3-j6hh
• https://github.com/TrueLayer/truelayer-dotnet/commit/75e436ed5360faa73d6e7ce3a9903a3c49505e3e
• https://github.com/TrueLayer/truelayer-dotnet/security/advisories/GHSA-67m4-qxp3-j6hh

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