---
title: "CVE-2026-89058: RESTEasy - CORS Misconfiguration"
description: "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."
url: https://panop.io/threat-heartbeat/CVE-2026-89058/
---

# 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 ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89058)

## 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](https://cwe.mitre.org/data/definitions/346.html) [CWE-942](https://cwe.mitre.org/data/definitions/942.html)

## 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

- [https://nvd.nist.gov/vuln/detail/CVE-2026-89058](https://nvd.nist.gov/vuln/detail/CVE-2026-89058)
- [https://access.redhat.com/security/cve/CVE-2026-89058](https://access.redhat.com/security/cve/CVE-2026-89058)
- [https://bugzilla.redhat.com/show\_bug.cgi?id=2519775](https://bugzilla.redhat.com/show_bug.cgi?id=2519775)
- [https://github.com/resteasy/resteasy/security/advisories/GHSA-972r-f3fv-whm3](https://github.com/resteasy/resteasy/security/advisories/GHSA-972r-f3fv-whm3)
- [https://github.com/resteasy/resteasy/commit/efeb2b7](https://github.com/resteasy/resteasy/commit/efeb2b7)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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