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CriticalVulnerabilityCVE-2026-112256updated 29 Oct 2026, 20:04 UTC

OpenText Advanced Authentication Server flaw lets attackers reach restricted functions

A flaw in this login-security server can let someone reach features they should not be allowed to use. The material does not describe exploitation or a fix in detail.

Official, 2 sources
SeverityCriticalCVSS 9.2 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

What happened

OpenText Advanced Authentication Server accepts untrusted data alongside trusted data, which allows access to functionality that is not properly restricted by access control lists (ACLs).

Why it is dangerous: Attackers may be able to bypass access restrictions on an authentication server, which could expose or change protected login and identity functions. Organizations running the affected versions are at risk.

Are you affected?

You are affected if you run OpenText Advanced Authentication Server version 6.4.0.0 through 6.4.3.8, 6.5.0.0 through 6.5.0.10, or 6.6.0.0 through 6.6.1.0.

OpenText Advanced Authentication Server: 6.4.0.0 to 6.4.3.8; 6.5.0.0 to 6.5.0.10; 6.6.0.0 to 6.6.1.0

What to do

  1. Check whether your Advanced Authentication Server version falls within the affected ranges
  2. Apply the vendor's patched release or official mitigation from OpenText as soon as it is available
  3. Restrict network access to the authentication server to trusted administrators until patched

Timeline

  1. 29 Oct 2026, 16:17 UTC
    Publicly disclosed
  2. 29 Oct 2026, 16:17 UTC
    Reported by NVD · NVD
  3. 29 Oct 2026, 16:20 UTC
    Picked up by Zero Radar
  4. 29 Oct 2026, 20:04 UTC
    GitHub Advisory reported on it · GitHub Advisory

Sources 2 reports, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
CVE-2026-112256 · GHSA-rqjf-xhwg-fh67
CVSS
9.2 / 10
EPSS
0.2% chance of exploitation within 30 days
Disclosed
29 Oct 2026, 16:17 UTC
On Zero Radar
29 Oct 2026, 16:20 UTC (2 min after disclosure)
Last change
29 Oct 2026, 20:04 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

OpenText Advanced Authentication Server flaw lets attackers reach restricted functions · Zero Radar