SteeltoeOSS Steeltoe.Security.Authentication.CloudFoundryBase up to 3.3.x JWT Signing Key exposure of resource

CVSS Meta Temp Score
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CTI Interest Score
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4.9$0-$5k1.89

Summaryinfo

A vulnerability marked as problematic has been reported in SteeltoeOSS Steeltoe.Security.Authentication.CloudFoundryBase, Steeltoe.Security.Authentication.JwtBearer and Steeltoe.Security.Authentication.OpenIdConnect up to 3.3.x. The impacted element is an unknown function of the component JWT Signing Key Handler. Performing a manipulation results in exposure of resource. This vulnerability is cataloged as CVE-2026-50202. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in SteeltoeOSS Steeltoe.Security.Authentication.CloudFoundryBase, Steeltoe.Security.Authentication.JwtBearer and Steeltoe.Security.Authentication.OpenIdConnect up to 3.3.x. This affects an unknown code of the component JWT Signing Key Handler. The manipulation with an unknown input leads to a exposure of resource vulnerability. CWE is classifying the issue as CWE-668. The product exposes a resource to the wrong control sphere, providing unintended actors with inappropriate access to the resource. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Steeltoe is an open source project that provides a collection of libraries that helps users build cloud-native applications. In Steeltoe.Security.Authentication.CloudFoundryBase prior to version 3.4.0, Steeltoe.Security.Authentication.JwtBearer prior to version 4.2.0, and Steeltoe.Security.Authentication.OpenIdConnect prior to version 4.2.0, the JWT signing key cache in `TokenKeyResolver` uses `kid` as the sole cache key without namespacing by authority. In applications with multiple `JwtBearer` schemes pointing to different identity providers, a key fetched for one scheme can satisfy token validation for another. Additionally, cached keys have no expiration, so rotated or revoked keys remain trusted until the application process restarts. Steeltoe.Security.Authentication.CloudFoundryBase version 3.4.0, Steeltoe.Security.Authentication.JwtBearer version 4.2.0, and Steeltoe.Security.Authentication.OpenIdConnect version 4.2.0 patch the issue. If an immediate upgrade is not possible: In multi-scheme deployments, configure only one `JwtBearer` scheme per application when different identity providers are required; and/or restart the application process after an identity provider signing key rotation to clear stale cached keys.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-50202 since 06/04/2026. The exploitability is told to be difficult. It is possible to initiate the attack remotely. Additional levels of successful authentication are needed for exploitation. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 3.4.0 eliminates this vulnerability. Applying the patch 04db2ace3b806bfe0260bb7d4bda340f241eff48 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.0
VulDB Meta Temp Score: 4.9

VulDB Base Score: 4.1
VulDB Temp Score: 3.9
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.9
CNA Vector (GitHub_M): 🔒

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Exposure of resource
CWE: CWE-668 / CWE-200 / CWE-284
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Steeltoe.Security.Authentication.CloudFoundryBase/Steeltoe.Security.Authentication.JwtBearer/Steeltoe.Security.Authentication.OpenIdConnect 3.4.0
Patch: 04db2ace3b806bfe0260bb7d4bda340f241eff48

Timelineinfo

06/04/2026 CVE reserved
06/18/2026 +14 days Advisory disclosed
06/18/2026 +0 days VulDB entry created
06/18/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: GHSA-7fqc-p256-7pwj
Status: Confirmed

CVE: CVE-2026-50202 (🔒)
GCVE (CVE): GCVE-0-2026-50202
GCVE (VulDB): GCVE-100-372159

Entryinfo

Created: 06/18/2026 07:41
Changes: 06/18/2026 07:41 (67)
Complete: 🔍
Cache ID: 216::103

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