Vulnerability Description
A flaw was found in Keycloak. A remote, unauthenticated attacker can send a specially crafted XML input to the Security Assertion Markup Language (SAML) endpoint. This malicious input can cause high CPU usage and worker thread starvation, leading to a Denial of Service (DoS) where the server becomes unavailable.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Redhat | Build Of Keycloak | >= 26.4, < 26.4.12 |
Related Weaknesses (CWE)
References
- https://access.redhat.com/errata/RHSA-2026:19594Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:19595Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:19596Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:19597Vendor Advisory
- https://access.redhat.com/security/cve/CVE-2026-7307Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2476526Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:19594Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:19595Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:19596Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:19597Vendor Advisory
- https://access.redhat.com/security/cve/CVE-2026-7307Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2476526Vendor Advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-7307.json
FAQ
What is CVE-2026-7307?
CVE-2026-7307 is a vulnerability with a CVSS score of 7.5 (HIGH). A flaw was found in Keycloak. A remote, unauthenticated attacker can send a specially crafted XML input to the Security Assertion Markup Language (SAML) endpoint. This malicious input can cause high C...
How severe is CVE-2026-7307?
CVE-2026-7307 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-7307?
Check the references section above for vendor advisories and patch information. Affected products include: Redhat Build Of Keycloak.