CVE-2026-81868

MEDIUM
Published Sep 17, 2026 Modified Sep 23, 2026 CWE-288 CWE-295

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, Steeltoe.Security.Authorization.Certificate deployments using AddOrgAndSpacePolicies() and UseCertificateAuthorization() trust the public certificate supplied in the X-Client-Cert request header without proving possession of the corresponding private key. Common Cloud Foundry routers do not remove this header from inbound requests. When inbound requests are not restricted to a known trusted proxy source IP, an attacker who obtains the public certificate of an application instance in the target organization or space and can reach the application can spoof X-Client-Cert to bypass the SameOrg and SameSpace policies for the certificate validity period. This issue is fixed in version 4.3.0.

Is your site exposed to CVE-2026-81868?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

6.5
MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

EPSS — Exploit Prediction

0.0025
Probability of exploitation
0.15%
Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-288 CWE-288
CWE-295 CWE-295

References

Frequently Asked Questions

What is CVE-2026-81868? +
Steeltoe is an open source project that provides a collection of libraries that helps users build cloud-native applications. Prior to 4.3.0, Steeltoe.Security.Authorization.Certificate deployments using AddOrgAndSpacePolicies() and UseCertificateAuthorization() trust the public certificate supplied in the X-Client-Cert request header without proving possession of the corresponding private key. Common Cloud Foundry routers do not remove this header from inbound requests. When inbound requests are not restricted to a known trusted proxy source IP, an attacker who obtains the public certificate of an application instance in the target organization or space and can reach the application can spoof X-Client-Cert to bypass the SameOrg and SameSpace policies for the certificate validity period. This issue is fixed in version 4.3.0. It has a CVSS v3.1 base score of 6.5 (MEDIUM).
How severe is CVE-2026-81868? +
CVE-2026-81868 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0025, placing it in the 0th percentile for exploitation probability.
How do I check if I'm vulnerable to CVE-2026-81868? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2026-40582

ChurchCRM is an open-source church management system. In versions prior to 7.2.0, the /api/public/user/login endpoint validates only the username and …
CVE-2025-23217

mitmproxy is a interactive TLS-capable intercepting HTTP proxy for penetration testers and software developers and mitmweb is a web-based interface …
CVE-2025-2080

Optigo Networks Visual BACnet Capture Tool and Optigo Visual Networks Capture Tool version 3.1.2rc11 contain an exposed web management service …
CVE-2025-29996

This vulnerability exists in the CAP back office application due to improper implementation of OTP verification mechanism in its API …
CVE-2025-2492

An improper authentication control vulnerability exists in AiCloud. This vulnerability can be triggered by a crafted request, potentially leading to …
CVE-2025-4687

In Teltonika Networks Remote Management System (RMS), it is possible to perform account pre-hijacking by misusing the invite functionality. If …

Don't wait for an exploit

Scan your website for vulnerabilities like CVE-2026-81868 — free, no signup required.