Vulnerability Description
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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://access.redhat.com/security/cve/CVE-2026-89058
- https://bugzilla.redhat.com/show_bug.cgi?id=2519775
- https://github.com/resteasy/resteasy/commit/efeb2b7
- https://github.com/resteasy/resteasy/security/advisories/GHSA-972r-f3fv-whm3
- https://github.com/resteasy/resteasy/security/advisories/GHSA-972r-f3fv-whm3
FAQ
What is CVE-2026-89058?
CVE-2026-89058 is a vulnerability with a CVSS score of 7.4 (HIGH). 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...
How severe is CVE-2026-89058?
CVE-2026-89058 has been rated HIGH with a CVSS base score of 7.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-89058?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.