CVE-2026-89058 RESTEasy - CORS Misconfiguration

RESTEasy CorsFilter contains a CORS misconfiguration caused by reflecting the Origin header with Access-Control-Allow-Credentials set to true when allowing all origins, letting attackers perform credentialed cross-origin requests and read authenticated responses, exploit requires permissive CORS configuration.

CVSS base score 7.4 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.23% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
CORS Misconfiguration
Impact
Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
Published
18 September 2026
Updated
15 October 2026
Weakness
CWE-346 CWE-942

Vendor fix

Update to the latest version with fixed CORS handling or configure CORS to restrict origins and disallow credentials with wildcard origins.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

← All CVEs