CVE-2026-89058
highpriority · track · 30EPSS 0.003 · 17 %ileDEUSEPSS · scored 2026-10-27
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
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.8–7.4
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (4)
Products and version ranges known to be affected.
advisories (1)
Vendor and ecosystem advisories describing this.
- WID-SEC-W-2026-4029Red Hat Enterprise Linux (python-tornado, resteasy-core, bubblewrap, pgvector): Mehrere SchwachstellenDeutsch2026-10-19csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Red Hat Enterprise Linux ausnutzen, um Sicherheitsvorkehrungen zu umgehen, beliebigen Code auszuführen, Daten zu manipulieren und offenzulegen oder einen Denial-of-Service-Angriff auszulösen.
sources
Which sources assert this record, and when.
references (7) nvd
External citations — patches, advisories, analysis.
- https://access.redhat.com/errata/RHSA-2026:83082
- https://access.redhat.com/errata/RHSA-2026:83520
- https://access.redhat.com/errata/RHSA-2026:85234
- 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
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