CVE-2026-89058: Resteasy-core: resteasy: corsfilter reflects arbitrary origin with credentials under wildcard config
A flaw was found in RESTEasy's CorsFilter, which, when configured to allow all origins ("*"), reflects the request's Origin header back in the Access-Control-Allow-Origin response together with Access-Control-Allow-Credentials: true. This permissive cross-origin policy allows a malicious website to make credentialed cross-origin requests and read authenticated responses from a victim's session, resulting in a loss of confidentiality.
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cwe · low confidence lookup
CWE-346: Exact CWE lookup
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Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
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CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
CWE-346 · source CWE mapping
Origin Validation Error
Origin Validation Error represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Permissive Cross-domain Security Policy with Untrusted Domains
Permissive Cross-domain Security Policy with Untrusted Domains represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.