What is CVE-2026-101521?

CVE-2026-101521 is a critical-severity vulnerability in Oracle Corporation Apex, classified under Improper Authentication. CVSS score: 9.8/10. Published 2026-10-20.

How severe is CVE-2026-101521?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Oracle Corporation Apex

CVE-2026-101521

Vulnerability in Oracle APEX (component: General). Supported versions that are affected are 24.1.0-24.1.21, 24.2.0-24.2.20 and 26.1.0-26.1.4. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTPS to compromise Oracle APEX. Successful attacks of this vulnerability can result in takeover of Oracle APEX. CVSS 3.1 Base Score 9.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

Vulnerability class: Broken Authentication

Published 2026-10-20 · last modified 2026-10-21.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Oracle Corporation Apex

Weakness classification (CWE)

References

www.oracle.com/security-alerts/cpuoct2026.html (vendor-advisory)

Frequently asked questions

What is CVE-2026-101521?: CVE-2026-101521 is a critical-severity vulnerability in Oracle Corporation Apex, classified under Improper Authentication. CVSS score: 9.8/10. Published 2026-10-20.
How severe is CVE-2026-101521?: Critical severity. CVSS v3 base score is 9.8 out of 10.