How do I check whether I am affected by CVE-2026-101521?

In the database as a DBA, run: SELECT version_no FROM apex_release; (or SELECT VERSION FROM dba_registry WHERE comp_id='APEX';). Affected if it is 24.1.0-24.1.21, 24.2.0-24.2.20 or 26.1.0-26.1.4. APEX in Oracle Autonomous/managed services is patched by Oracle.

What is the fix for CVE-2026-101521?

Apply the Oracle October 2026 CPU APEX patch. Expected first fixed builds, inferred and not stated by Oracle: 24.1.22, 24.2.21, 26.1.5. Check the patch readme on My Oracle Support to confirm.

Who is not affected by CVE-2026-101521?

Not affected if: default-config, managed-hosting.

Live › vulnerability › CVE-2026-101521

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critical9.8Package

Oracle APEX: unauthenticated network flaw lets attackers take over the app

Oracle APEX versions 24.1.0-24.1.21, 24.2.0-24.2.20 and 26.1.0-26.1.4 contain a flaw that an unauthenticated attacker can reach over HTTPS. Successful exploitation gives the attacker full takeover of the APEX instance, scored CVSS 9.8.

Summary written from the sources below. Check the originals before acting.

CVSS 3.x

9.8

critical

scored by [email protected]

known so far5 of 6

missing: exploitation

First public: Oct 20, 2026 UTC
Last modified: Oct 23, 2026
Status: open
Known exploitation: None reported
Public exploit: None on GitHub
EPSS: not scored

First seen by InfraStack 2026-10-23 21:57 UTC. All times on this page are UTC.

Why it is critical, and not just CVSS

Likelihood → · Impact ↓

critical

high

medium

high

medium

low

medium

low

Exploited: No reports yet.
Needs login: No.
Needs a special setup: Not known from the sources.
Reachable from: internet.
Worst case: Attacker takes over the APEX instance and reads or changes its data.
CVSS said: 9.8. The facts above agree.

Who is affected

1 product

Know the next one before it finds you.

Add to Slack

Live › vulnerability › CVE-2026-101521

Go to dashboard

critical9.8Package

Oracle APEX: unauthenticated network flaw lets attackers take over the app

Summary written from the sources below. Check the originals before acting.

CVSS 3.x

9.8

critical

scored by [email protected]

known so far5 of 6

missing: exploitation

First public: Oct 20, 2026 UTC
Last modified: Oct 23, 2026
Status: open
Known exploitation: None reported
Public exploit: None on GitHub
EPSS: not scored

First seen by InfraStack 2026-10-23 21:57 UTC. All times on this page are UTC.

Why it is critical, and not just CVSS

Likelihood → · Impact ↓

critical

high

medium

high

medium

low

medium

low

Exploited: No reports yet.
Needs login: No.
Needs a special setup: Not known from the sources.
Reachable from: internet.
Worst case: Attacker takes over the APEX instance and reads or changes its data.
CVSS said: 9.8. The facts above agree.

Who is affected

1 product

Know the next one before it finds you.

Add to Slack

Oracle APEX: unauthenticated network flaw lets attackers take over the app

Why it is critical, and not just CVSS

Who is affected

Know the next one before it finds you.

Oracle APEX: unauthenticated network flaw lets attackers take over the app

Why it is critical, and not just CVSS

Who is affected

Know the next one before it finds you.

How to check

The fix

Who had it, and when

What the sources say, verbatim

Sources