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CVE-2026-89058

HIGH 7.4 PoC AVAILABLE ALL-YEARS

Published 2026-09-18 · Last modified 2026-10-15 · redhat · NVD: Awaiting Analysis

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.

EXPLOIT AVAILABLE

Public exploit or PoC code exists. The barrier to attack is reduced — watch closely.

Exploitation likelihood

0.2%chance of exploitation in 30 days · 15th percentile

○ In CISA KEV● Public exploit / PoC◆ SSVC: exploitation poc, automatable no

Impact if exploited

7.4CVSS 3.1 · HIGH · CNA

  • ConfidentialityHigh
  • IntegrityNone
  • AvailabilityNone

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ⚠User interaction: A user must take an action (click / open a file)
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept & exploit code

Test against your own equipment

curl -s https://vulnpedia.com/cve/CVE-2026-89058/poc.jsonMachine-readable PoC index for this CVE (for automation).

For defensive triage, patch verification, and authorized testing on systems you own. Machine-readable: /cve/CVE-2026-89058/poc.json

Affected

Vendors Red Hat

Products Red Hat Build Of Quarkus 3.27.6.Redhat Red Hat Build Of Quarkus 3.33.4.Redhat Red Hat Build Of Apache Camel 4 For Quarkus 3 Red Hat Build Of Apicurio Registry 3 Red Hat Build Of Debezium 3 Red Hat Build Of Keycloak Red Hat Certificate System 10 Red Hat Certificate System 11 Red Hat Enterprise Linux 10 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 9 Red Hat Fuse 7 Red Hat Jboss Enterprise Application Platform 7 Red Hat Jboss Enterprise Application Platform 8 Red Hat Jboss Enterprise Application Platform Expansion Pack Red Hat Satellite 6 Red Hat Single Sign On 7

Weakness (CWE)

  • CWE-346: Origin Validation Error
  • CWE-942: Permissive Cross-domain Policy with Untrusted Domains

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N

All CVSS metrics

  • HIGH 7.4 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
  • HIGH 7.4 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N

References

Exploits & PoC

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS