OpenText Advanced Authentication Server up to 6.4.3.x/6.5.0.x/6.6.1.0 Unauthenticated Endpoint allocation of resources

Summaryinfo

A vulnerability has been found in OpenText Advanced Authentication Server up to 6.4.3.x/6.5.0.x/6.6.1.0 and classified as critical. This affects an unknown function of the component Unauthenticated Endpoint. This manipulation causes allocation of resources. This vulnerability is tracked as CVE-2026-112255. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in OpenText Advanced Authentication Server up to 6.4.3.x/6.5.0.x/6.6.1.0 and classified as critical. Affected by this vulnerability is an unknown part of the component Unauthenticated Endpoint. The manipulation with an unknown input leads to a allocation of resources vulnerability. The CWE definition for the vulnerability is CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. As an impact it is known to affect availability. The summary by CVE is:

Initialization of a resource with an insecure default vulnerability in OpenText Advanced Authentication Server allows Excessive Allocation. This issue affects Advanced Authentication Server: from 6.4.0.0 through 6.4.3.x, from 6.5.0.0 through 6.5.0.x, and from 6.6.0.0 through 6.6.1.0. The fix for this is issue is to create a secure configuration.  The 6.6.2.0 release has a best practice entry if the configuration is unsecure. A secure configuration is to NOT allow creation/recreation of Unauthenticated Endpoints.  If creation/recreation of Unauthenticated Endpoints is required, you should only allow it from trusted networks.   To remedy this issue, change your configuration to NOT allow creation/recreation of Unauthenticated Endpoints. If you require Unauthenticated Endpoints, you MUST change your configuration to use a non-empty whitelist to specify the trusted networks.  An empty whitelist will allow all networks to create/recreate endpoints.

The advisory is shared at docs.microfocus.com. This vulnerability is known as CVE-2026-112255 since 10/19/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• OpenText

Name

• Advanced Authentication Server

Version

• 6.4.0
• 6.4.1
• 6.4.2
• 6.4.3
• 6.5.0
• 6.6.0
• 6.6.1.0

License

• commercial

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Discussion