How do I check whether I am affected by CVE-2026-91343?

Affected only if you run Outside In Technology 8.5.8, or an Oracle or third-party product that bundles the Outside In Clean Content SDK 8.5.8. Oracle's public pages give no install-version command. Check the SDK/library version in your product's install directory or release notes, or ask the vendor of the embedding product. Oracle customers can find it in MOS.

What is the fix for CVE-2026-91343?

Apply the Oct 2026 Critical Patch Update patch for Oracle Outside In Technology (Fusion Middleware patch availability document, MOS note, login required). The public advisory does not name a fixed version: unknown. A MOS login would settle it.

Live › vulnerability › CVE-2026-91343

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high8.6Other

Oracle Outside In: unauthenticated network flaw lets attacker alter critical data

Oracle Outside In Technology 8.5.8 (component Outside In Clean Content SDK) has an improper-authorization flaw (CWE-285 per VulDB) reachable by an unauthenticated attacker over HTTP. It allows unauthorized creation, deletion or modification of critical data (CVSS 3.1 8.6, vector AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N). Scope change means products that embed the SDK are also affected. Fixed in Oracle's October 2026 Critical Patch Update. No known exploitation.

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

CVSS 3.x

8.6

high

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 high, 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 creates, deletes or modifies critical data remotely without credentials.
CVSS said: 8.6. The facts above say critical; we keep the sources' high until an analyst looks.

Who is affected

1 product

Know the next one before it finds you.

Add to Slack

Live › vulnerability › CVE-2026-91343

Go to dashboard

high8.6Other

Oracle Outside In: unauthenticated network flaw lets attacker alter critical data

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

CVSS 3.x

8.6

high

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 high, 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 creates, deletes or modifies critical data remotely without credentials.
CVSS said: 8.6. The facts above say critical; we keep the sources' high until an analyst looks.

Who is affected

1 product

Know the next one before it finds you.

Add to Slack

Oracle Outside In: unauthenticated network flaw lets attacker alter critical data

Why it is high, and not just CVSS

Who is affected

Know the next one before it finds you.

Oracle Outside In: unauthenticated network flaw lets attacker alter critical data

Why it is high, 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