CVE-2026-89058
High · 7.4CVSS
7.4
EPSS
0.3%
Published
Sep 18, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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