EUVD-2026-82736Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
Agree with vendor: unauthenticated attacker (victim supplies session) so PR:N, victim must visit malicious page so UI:R, cross-authority read so S:C, confidentiality-only so I:N/A:N.
Primary rating from Vendor (redhat).
CVSS VectorVendor: redhat
Lifecycle Timeline
5DescriptionCVE.org
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.
Articles & Coverage 1
AnalysisAI
Cross-origin data exposure in RESTEasy's CorsFilter (CVSS 7.4) occurs when a deployment is configured with allowedOrigins set to the wildcard '*' together with allowCredentials=true, causing the filter to reflect the caller's Origin header back in Access-Control-Allow-Origin alongside Access-Control-Allow-Credentials: true. Because that configuration defeats the browser's built-in guard against combining wildcard origins with credentials, an attacker who lures an already-authenticated user (UI:R) to an attacker-controlled page can issue credentialed cross-origin requests and read that user's authenticated API responses - a confidentiality-only impact (C:H/I:N/A:N), with no integrity or availability effect. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires the target application to have RESTEasy's CorsFilter explicitly enabled and configured with allowedOrigins set to the wildcard '*' AND allowCredentials=true - this is a non-default developer/operator configuration, not RESTEasy's out-of-the-box behavior. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine but conditionally-exploitable CORS misconfiguration in RESTEasy's CorsFilter, not a raw-code-execution flaw. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The primary remedy is configuration, not a code upgrade: stop using allowedOrigins="*" on RESTEasy's CorsFilter and replace it with an explicit, exact-match allowlist of trusted origins (scheme, host, and port), and only keep allowCredentials=true if that allowlist is in place - the reflected-origin-plus-credentials combination is the defect. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Java services using RESTEasy's CorsFilter (any version) and check each deployment's CORS configuration for the combination of allowedOrigins set to '*' and allowCredentials=true; treat any match as exposed and immediately change allowedOrigins to an explicit list of trusted domains, or set allowCredentials=false if credentialed cross-origin access is not a business requirement, then redeploy. …
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