CVE-2026-75523 Steeltoe.Management.Endpoint: HttpExchanges URI masking leaks query-string secrets
Attackers with access to the exposed actuator endpoint can read sensitive query-string secrets like tokens and API keys from recorded HTTP exchanges.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-75523?
CVE-2026-75523 is a medium-severity vulnerability in SteeltoeOSS security-advisories, published on 17 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Steeltoe is an open source project that provides a collection of libraries that helps users build cloud-native applications. Prior to 4.3.0, the Steeltoe.Management.Endpoint /actuator/httpexchanges endpoint passes recorded request URIs through MaskedUri, which masks URI user information but does not inspect query strings. When Management:Endpoints:HttpExchanges:IncludeQueryString is enabled, the HttpExchangeRequest response can disclose OAuth tokens, password-reset tokens, signed-URL signatures, API keys, and other query-string secrets from prior traffic to a caller that can reach the explicitly exposed endpoint. The Steeltoe.Management.Endpoint.Actuators.HttpExchanges DEBUG logger also records these URIs, creating a second disclosure channel for users with log access. This issue is fixed in version 4.3.0.
Weakness: CWE-200
Which versions are affected by CVE-2026-75523?
2 open source packages ship an affected version, including Steeltoe.Management.Endpoint.
| Package | Affected | Fixed in |
|---|---|---|
Steeltoe.Management.Endpoint NuGet | All versions | 4.3.0 |
Steeltoe.Management.Endpoint NuGet | All versions | 4.3.0 |
How do I fix CVE-2026-75523?
Upgrade Steeltoe.Management.Endpoint to 4.3.0 or later.
Is CVE-2026-75523 being exploited?
There is no known exploitation of CVE-2026-75523 in the wild and no public exploit code.
Sources
Also known as GHSA-8phw-xrj9-cpqp.