Is there a public exploit for CVE-2026-89058?

No public exploit for CVE-2026-89058 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-89058?

CVE-2026-89058 scores CVSS 7.4 (v3.1), rated high. EPSS puts the chance of exploitation in the next 30 days at 0.26%.

What does CVE-2026-89058 affect?

CVE-2026-89058 affects Red Hat Red Hat Enterprise Linux 9, Red Hat build of Quarkus 3.27.6.redhat, Red Hat build of Quarkus 3.33.4.redhat, Red Hat Enterprise Linux 10.

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…

CVE-2026-89058

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.

Assessment

CVSS: 7.4 (v3.1)
Severity: High
EPSS: 0.26% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 18 September 2026
Last updated: 4 November 2026
Affected: Red Hat · Red Hat Enterprise Linux 10 · Red Hat Enterprise Linux 9 · Red Hat build of Quarkus 3.27.6.redhat · Red Hat build of Quarkus 3.33.4.redhat
Assigner: redhat

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N

At the source

EUVD (ENISA)

References

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