CVE-2026-89058

HIGHPre-NVD 7.47.4—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (38th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
7.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 7.4Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
7.4
EG Score
7.4HIGHmedium confidence
EG Risk
49
EG Risk 49/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity74% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
38th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 18, 2026

Last Modified

September 19, 2026

Advisory Details (3)

Auto-updated Sep 18, 2026
🔬 Proof of concept available. Patch available. Sources: redhat, github.
github Patch Available🟡 PoC Available

RESTEasy CorsFilter Reflects Arbitrary Origin with Credentials under Wildcard Config · Advisory · resteasy/resteasy · GitHub

https://github.com/resteasy/resteasy/security/advisories/GHSA-972r-f3fv-whm3
redhat

2519775 – (CVE-2026-89058) CVE-2026-89058 resteasy-core: RESTEasy: CorsFilter Reflects Arbitrary Origin with Credentials under Wildcard Config

https://bugzilla.redhat.com/show_bug.cgi?id=2519775
redhat Patch Available

CVE-2026-89058 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-89058

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
resteasy3.03.0.26-6
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
resteasy3.03.0.26-6
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
resteasy3.03.0.26-6
  • every version on: no fix on record
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 38× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-04 23:22 UTCEPSS rescore
  2. 2026-10-03 20:45 UTCEG score recompute
  3. 2026-10-02 18:22 UTCEG score recompute
  4. 2026-10-02 05:15 UTCEG score recompute
  5. 2026-10-01 19:51 UTCEPSS rescore
  6. 2026-10-01 02:58 UTCEG score recompute
  7. 2026-09-30 15:04 UTCEPSS rescore
  8. 2026-09-30 00:41 UTCEG score recompute
  9. 2026-09-28 21:42 UTCEG score recompute
  10. 2026-09-28 13:52 UTCEPSS rescore
  11. 2026-09-27 19:28 UTCEG score recompute
  12. 2026-09-27 13:48 UTCEPSS rescore
  13. 2026-09-26 17:12 UTCEG score recompute
  14. 2026-09-26 15:59 UTCEPSS rescore
  15. 2026-09-26 04:01 UTCEG score recompute
  16. 2026-09-25 01:41 UTCEG score recompute
  17. 2026-09-24 14:04 UTCEPSS rescore
  18. 2026-09-23 23:26 UTCEG score recompute
  19. 2026-09-23 17:54 UTCEPSS rescore
  20. 2026-09-22 21:13 UTCEG score recompute
  21. 2026-09-22 16:01 UTCEPSS rescore
  22. 2026-09-22 08:06 UTCEG score recompute
  23. 2026-09-21 21:09 UTCEPSS rescore
  24. 2026-09-21 05:52 UTCEG score recompute
  25. 2026-09-20 20:16 UTCEPSS rescore
Show 13 more
  1. 2026-09-20 03:37 UTCEG score recompute
  2. 2026-09-19 14:29 UTCEG score recompute
  3. 2026-09-19 13:57 UTCEG score recompute
  4. 2026-09-19 08:14 UTCEG score recompute
  5. 2026-09-18 19:28 UTCEPSS rescore
  6. 2026-09-18 13:22 UTCEG score recompute
  7. 2026-09-18 12:44 UTCEG score recompute
  8. 2026-09-18 12:19 UTCEG score recompute
  9. 2026-09-18 10:19 UTCEG score recompute
  10. 2026-09-18 09:24 UTCEG score recompute
  11. 2026-09-18 08:28 UTCEG score recompute
  12. 2026-09-18 07:29 UTCEG score recompute
  13. 2026-09-18 07:29 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-89058?
CVE-2026-89058 is a high vulnerability published on September 18, 2026. 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…
When was CVE-2026-89058 disclosed?
CVE-2026-89058 was first published on September 18, 2026, with the most recent update on September 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-89058 actively exploited?
CVE-2026-89058 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (38th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-89058?
CVE-2026-89058 has a CVSS base score of 7.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-89058?
A fix for CVE-2026-89058 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

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