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CriticalVulnerabilityCVE-2026-87251updated 25 Oct 2026, 18:35 UTC

Oracle Access Manager flaw lets attackers take over login system

Oracle Access Manager is the software that checks who can log in to company applications. A flaw in its SAML login handling lets an outsider, with no password, potentially take control of the whole system.

Official, 2 sources
SeverityCriticalCVSS 9.8 of 10
Being exploited?UnclearNo reports either way yet
Fix available?UnclearNo fixed version published in the sources yet
How sure is this?Official, 2 sourcesBacked by an official source

How the attack works simplified

  1. 1Outside attackerNo login or password needed
  2. 2Crafted SAML requestSent over the network to the login service
  3. 3Authentication Engine flawRequest is processed without proper checks
  4. 4Takeover of the productAttacker gains control of Access Manager
  5. ResultAttacker controls the login system

What happened

A critical, unauthenticated flaw in the Authentication Engine component of Oracle Access Manager (Oracle Fusion Middleware) can be exploited over the network via SAML requests, allowing full compromise of the product.

Why it is dangerous: An attacker who reaches the login service over the network needs no credentials and could gain control of confidentiality, integrity and availability, which can expose every application that relies on it for authentication.

Are you affected?

You are affected if you run Oracle Access Manager 12.2.1.4.0 or 14.1.2.1.0 with SAML exposed to the network.

Oracle Access Manager 12.2.1.4.0; Oracle Access Manager 14.1.2.1.0 (Oracle Fusion Middleware, Authentication Engine component)

What to do

  1. Check whether you run Oracle Access Manager 12.2.1.4.0 or 14.1.2.1.0.
  2. Apply the official Oracle security patch or update for this advisory as soon as it is available; the sources reviewed do not name a fixed version.
  3. Restrict network access to the SAML endpoints until patched, allowing only trusted sources.
  4. Review access and authentication logs for unusual SAML requests.

Timeline

  1. 20 Oct 2026, 22:20 UTC
    Publicly disclosed
  2. 20 Oct 2026, 22:20 UTC
    Reported by NVD · NVD
  3. 25 Oct 2026, 18:35 UTC
    GitHub Advisory reported on it · GitHub Advisory

Sources 2 reports, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
CVE-2026-87251 · GHSA-9m34-ch75-mhw4
CVSS
9.8 / 10
EPSS
0.5% chance of exploitation within 30 days
Disclosed
20 Oct 2026, 22:20 UTC
On Zero Radar
before the radar started
Last change
25 Oct 2026, 18:35 UTC

The plain-language parts and the attack diagram were written by an AI model (anthropic/claude-haiku-5.5) from the sources above. Facts like versions, exploitation and dates come from the sources themselves. How Zero Radar works

Oracle Access Manager flaw lets attackers take over login system · Zero Radar