CVE-2026-9793
📛 CVE Title
Keycloak: keycloak: security policy bypass in jwe-encrypted request object processing
Description
A flaw was found in Keycloak. When a JSON Web Encryption (JWE) encrypted request object is submitted, Keycloak may incorrectly process unsigned claims if the decrypted content is raw JSON, bypassing the configured signature policy. This allows a remote attacker to submit unauthorized claims, leading to a compromise of data integrity within the OpenID Connect (OIDC) authorization flow. While a redirect URI allowlist acts as a compensating control, this vulnerability violates OIDC Core and Financial-grade API (FAPI) signing requirements.
Overview
- State
- PUBLISHED
- Assigner (CNA)
- redhat
- CVSS severity
- MEDIUM
- CVSS score
- 5.9 / 10
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N- Effective score
- 5.9 / 10 MEDIUM source: CNA overview
- CWE(s)
-
CWE-347 - Reserved
- 2026-05-28
- Published
- 2026-05-28 03:44 UTC
- Last updated
- 2026-05-30 01:53 UTC
- Source
- https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/9xxx/CVE-2026-9793.json
- Linked Threat
- CVE-2026-9793 — CVE-2026-9793
NVD triage scoring NVD CVE 2.0
Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.
- NVD published
- 2026-05-28 05:16:40 UTC
- NVD last modified
- 2026-06-17 11:05:38 UTC
- NVD CVSS v3.1
- 5.9 / 10 MEDIUM source: secalert@redhat.com
- NVD CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N- Exploitability subscore
- 2.2 / 10
- Impact subscore
- 3.6 / 10
- EPSS score
- 0.0012 (probability of exploitation in next 30 days)
- EPSS percentile
- 2.12% vs all CVEs — higher = more likely to be exploited, as of 2026-08-01
NVD / KEV / EPSS data refreshed 2026-08-01 17:00 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.
European Union Vulnerability Database ENISA EUVD
ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.
- EUVD ID
-
EUVD-2026-32707 - Assigner
- redhat
- Published
- May 28, 2026, 3:44:17 AM
- Updated
- May 30, 2026, 1:53:11 AM
- EUVD base score (CVSS 3.1)
-
5.9 / 10
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N - EUVD-reported EPSS
- 0.1200
- Aliases
-
GHSA-p3v8-fm5p-v84h
ENISA description: A flaw was found in Keycloak. When a JSON Web Encryption (JWE) encrypted request object is submitted, Keycloak may incorrectly process unsigned claims if the decrypted content is raw JSON, bypassing the configured signature policy. This allows a remote attacker to submit unauthorized claims, leading to a compromise of data integrity within the OpenID Connect (OIDC) authorization flow. While a redirect URI allowlist acts as a compensating control, this vulnerability violates OIDC Core and Financial-grade API (FAPI) signing requirements.
Affected products (1)
| Vendor | Product | Versions | Platforms |
|---|---|---|---|
| Red Hat | Red Hat Build of Keycloak | — | — |
Affected products — CPE 2.3 (1) NVD
NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.
cpe:2.3:a:redhat:build_of_keycloak:-:*:*:*:-:*:*:*
Vendor references (2)
References embedded in the original CVE record by the assigning CNA.
- https://access.redhat.com/security/cve/CVE-2026-9793 vdb-entryx_refsource_REDHAT
- RHBZ#2482460 issue-trackingx_refsource_REDHAT
Web references (5)
DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.
- https://access.redhat.com/security/cve/CVE-2026-9793 tenable:access.redhat.com
- https://bugzilla.redhat.com/show_bug.cgi?id=2482460 tenable:bugzilla.redhat.com
- https://nvd.nist.gov/vuln/detail/CVE-2026-9793 tenable:nvd.nist.gov
- https://www.cve.org/CVERecord?id=CVE-2026-9793 tenable:www.cve.org
- https://www.first.org/epss/ tenable:www.first.org
NVD-tagged references (2)
Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.
- https://access.redhat.com/security/cve/CVE-2026-9793 secalert@redhat.com Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2482460 secalert@redhat.com Issue TrackingVendor Advisory
Remediations (17)
Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.
-
web:cvetodo.com
CVE-2026-9793 is a CVSS 5.9 medium-severity vulnerability in Red Hat products. Full technical analysis, mitigations , and exploit status — updated in real time.
2026-06-03 23:58 UTC -
web:cyberpress.org
A critical vulnerability in Google's MCP Toolbox for Databases is putting enterprise database systems at serious risk.
2026-06-03 23:58 UTC -
web:cybersecuritynews.com
Mitigation and Fixes Developers have addressed the vulnerability in recent updates by removing the wildcard origin header and enforcing strict origin validation. Organizations are strongly advised to upgrade MCP Toolbox to the latest patched version and avoid using permissive CORS policies in production environments.
2026-06-03 23:58 UTC -
web:cybersecuritynews.com
Microsoft's May 2026 Patch Tuesday lands with a heavy enterprise focus, fixing 120 vulnerabilities across Windows, Office, Azure, developer tools, and Microsoft 365 apps, including 29 remote code execution (RCE) flaws rated Critical.
2026-06-03 23:58 UTC -
web:nvd.nist.gov
The NVD is the U.S. government repository of standards based vulnerability management data represented using the Security Content Automation Protocol (SCAP). This data enables automation of vulnerability management, security measurement, and compliance. The NVD includes databases of security checklist references, security-related software flaws, product names, and impact metrics. For ...
2026-06-03 23:58 UTC -
web:portal.msrc.microsoft.com
The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.
2026-06-03 23:58 UTC -
web:vulmon.com
Vulnerability details of CVE-2026-9793 CVE-2026-9793 - JSON Web Encryption Claims Processing Vulnerability in Keycloak OIDC Authorization
2026-06-03 23:58 UTC -
web:www.microsoft.com
Security Update Guide Notifications Microsoft's free Security Update Guide Notifications provide links to security-related software updates and notification of re-released security updates. These notifications are sent via email throughout the month as needed.
2026-06-03 23:58 UTC -
web:www.oracle.com
Customers are strongly advised to apply the April 2026 Critical Patch Update for Fusion Middleware products, which includes patches for this Alert as well as additional patches. Affected Products and Patch Information Security vulnerabilities addressed by this Critical Patch Update affect the products listed below.
2026-06-03 23:58 UTC -
web:zecurit.com
Get the complete breakdown of Microsoft's June 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .
2026-06-03 23:58 UTC -
web:securityboulevard.com
Organizations must decide how to tackle vulnerabilities—through remediation , mitigation , or a combination of both. But which strategy is more effective? This blog explores the nuances of vulnerability remediation vs mitigation , their respective benefits, and how to choose the right approach.
2026-06-19 02:28 UTC -
web:support.microsoft.com
Applies to: Windows Server 2019 This security update includes fixes and quality improvements that are part of the following update: May 12, 2026—KB5087538 (OS Build 17763.8755) The following is a summary of the issues that this update addresses when you install this update. The bold text within the brackets indicates the item or area of the change we are documenting. [Secure Boot] This ...
2026-06-19 02:28 UTC -
web:www.crowdstrike.com
Microsoft has released security updates for 130 vulnerabilities, including 30 critical, in its May 2026 Patch Tuesday rollout.
2026-06-19 02:28 UTC -
web:www.malwarebytes.com
Microsoft says it's working on a fix for an unpatched Defender vulnerability that can give attackers the highest level of access on Windows.
2026-06-19 02:28 UTC -
web:www.oracle.com
This Critical Security Patch Update contains 35 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Security Patch Update and other Oracle Software Security Assurance activities is located at May 2026 Critical Security Patch Update: Executive Summary and Analysis.
2026-06-19 02:28 UTC -
web:www.rapid7.com
Microsoft is publishing 200 vulnerabilities on June 2026 Patch Tuesday, including an HTTP/2 denial of service vulnerability and an elevation of privilege vulnerability in PowerToys.
2026-06-19 02:28 UTC -
web:www.veeam.com
When a vulnerability is identified, our team promptly develops a patch to address and mitigate the risk. In line with our dedication to transparency, we publicly disclose the vulnerability and provide detailed mitigation information.
2026-06-19 02:28 UTC
AI Forensic Analysis
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Raw JSON
The full cvelistV5 record. Download as CVE-2026-9793.json.
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