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.
{
"cna_assigner": "redhat",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89058.json",
"unresolved_ranges": [
{
"extracted_events": [
{
"fixed": "6.2.19.Final"
},
{
"introduced": "7.0.0.Alpha1"
},
{
"fixed": "7.0.5.Final"
}
],
"source": "AFFECTED_FIELD"
}
]
}