CVE-2026-34311 Auth bypass in Oracle Hospitality OPERA 5 Property Services

Critical 9.8 Published 28 May 2026 Updated 29 May 2026

Unauthenticated attackers can take over Oracle Hospitality OPERA 5 Property Services via HTTP, leading to full system compromise.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-34311?

CVE-2026-34311 is a critical authentication bypass vulnerability in Oracle Hospitality OPERA 5 Property Services, published on 28 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Vulnerability in the Oracle Hospitality OPERA 5 Property Services product of Oracle Hospitality Applications (component: Opera). Supported versions that are affected are 5.6.19.24, 5.6.22, 5.6.25.19, 5.6.27.6 and 5.6.28. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle Hospitality OPERA 5 Property Services. Successful attacks of this vulnerability can result in takeover of Oracle Hospitality OPERA 5 Property Services. CVSS 3.1 Base Score 9.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

Which versions are affected by CVE-2026-34311?

It affects 1 product.

Products include Oracle Hospitality Opera 5 Property Services.

How do I fix CVE-2026-34311?

No fix has been published for CVE-2026-34311 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2026-34311 being exploited?

There is no known exploitation of CVE-2026-34311 in the wild and no public exploit code.

Sources

Also known as GHSA-g89r-3vv2-wxjx.