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.
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Fri, 18 Sep 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 18 Sep 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Fri, 18 Sep 2026 09:30:00 +0000

Type Values Removed Values Added
First Time appeared Redhat
Redhat apicurio Registry
Redhat build Keycloak
Redhat camel Quarkus
Redhat certificate System
Redhat debezium
Redhat enterprise Linux
Redhat jboss Enterprise Application Platform
Redhat jboss Fuse
Redhat jbosseapxp
Redhat quarkus
Redhat red Hat Single Sign On
Redhat satellite
CPEs cpe:/a:redhat:apicurio_registry:3
cpe:/a:redhat:build_keycloak:
cpe:/a:redhat:camel_quarkus:3
cpe:/a:redhat:certificate_system:10
cpe:/a:redhat:certificate_system:11
cpe:/a:redhat:debezium:3
cpe:/a:redhat:jboss_enterprise_application_platform:7
cpe:/a:redhat:jboss_enterprise_application_platform:8
cpe:/a:redhat:jboss_fuse:7
cpe:/a:redhat:jbosseapxp
cpe:/a:redhat:quarkus:3
cpe:/a:redhat:red_hat_single_sign_on:7
cpe:/a:redhat:satellite:6
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat apicurio Registry
Redhat build Keycloak
Redhat camel Quarkus
Redhat certificate System
Redhat debezium
Redhat enterprise Linux
Redhat jboss Enterprise Application Platform
Redhat jboss Fuse
Redhat jbosseapxp
Redhat quarkus
Redhat red Hat Single Sign On
Redhat satellite
References

Fri, 18 Sep 2026 07:30:00 +0000

Type Values Removed Values Added
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.
Title Resteasy-core: resteasy: corsfilter reflects arbitrary origin with credentials under wildcard config
References
Metrics cvssV3_1

{'score': 7.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-09-18T12:25:28.110Z

Reserved: 2026-09-10T18:20:52.114Z

Link: CVE-2026-89058

cve-icon Vulnrichment

Updated: 2026-09-18T12:04:31.443Z

cve-icon NVD

Status : Received

Published: 2026-09-18T08:17:01.653

Modified: 2026-09-18T13:18:37.290

Link: CVE-2026-89058

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-09-17T14:00:00Z

Links: CVE-2026-89058 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses

No weakness.