Vulnerability record/PUBLISHED/Published Sep 18, 2026 07:20:29 UTC
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.
Base score7.4/ 10
SeverityHighCVSS 3.1
Exploitability / impact
CVSS metric breakdown
Base severityHigh
Attack vectorNetworkAV
Attack complexityLowAC
Privileges requiredNonePR
User interactionRequiredUI
ScopeChangedS
Confidentiality impactHighC
Integrity impactNoneI
Availability impactNoneA
CVSS vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:NCVSS communicates standardized severity and impact characteristics. It does not establish whether a system is exploitable in your specific environment.
Record context
CVE Numbering Authorityredhat
Last updatedNov 9, 2026 01:47:30 UTC
PublishedSep 18, 2026 07:20:29 UTC
ReservedSep 10, 2026 18:20:52 UTC
Credits
- Red Hat would like to thank Yu Bao (PayPal Cyber Security Team) for reporting this issue.