CVE-2026-89058 — Vulnerability intelligence
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Published:
- CVSS
- 7.4
- CISA KEV
- Not listed; not proof of no exploitation
Original source text (not a translation)
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.