CVE-2026-9793

Name: CVE-2026-9793
Creator: NVD / NIST
Published: 2026-05-28T05:16:40.697+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.12%

Last modified Jun 17, 2026

CVE-2026-9793 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.12% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.12%

2.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-347

Affected Software

Vendor	Product	Versions
Redhat	Build Of Keycloak	All versions

References

https://access.redhat.com/security/cve/CVE-2026-9793Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2482460Issue Tracking, Vendor Advisory

Timeline

Published: May 28, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-9793?

How severe is CVE-2026-9793?

CVE-2026-9793 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.12% probability of exploitation in the next 30 days.

How do I fix CVE-2026-9793?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-9793?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST