CVE-2026-34311: Vulnerability in the Oracle Hospitality OPERA 5 Property Services product of Oracle Hospitality Applications (

This month

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2026-34311 is a critical-severity flaw (CVSS 9.8) affecting hospitality opera 5 property services. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 Oracl

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 60%)
CISA exploited list	No
Published	2026-05-28
Last modified	2026-10-14

Publisher (CNA): Oracle · Vendor: oracle

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-28 21:16 UTCPublished CVE record published
2026-10-14 20:10 UTCUpdated Record last modified

oracle hospitality opera 5 property services DOWNGRADE

Affected: 5.6.19.24 · 5.6.22 · 5.6.25.19 · 5.6.27.6 · 5.6.28

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.6.19.24

1. Check installed version

apt-cache policy hospitality-opera-5-property-services || rpm -q hospitality-opera-5-property-services || hospitality-opera-5-property-services --version

2. No fixed release: DOWNGRADE to a release before 5.6.19.24 (Debian / Ubuntu)

apt-cache madison hospitality-opera-5-property-services sudo apt install hospitality-opera-5-property-services=<VERSION_BEFORE_5.6.19.24> sudo apt-mark hold hospitality-opera-5-property-services

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list hospitality-opera-5-property-services sudo dnf downgrade hospitality-opera-5-property-services-<VERSION_BEFORE_5.6.19.24> sudo dnf versionlock add hospitality-opera-5-property-services

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-34311?

hospitality opera 5 property services: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-34311 being exploited?

CVE-2026-34311 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-34311 affect?

CVE-2026-34311 affects hospitality opera 5 property services. Severity is critical (CVSS 9.8). 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 exploitabl

How urgent is CVE-2026-34311?

Priority 49/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-71106 HIGH 8.8 DOWNGRADE Vulnerability in the Oracle Hospitality OPERA 5 Property Services product of Oracle Hospitality Applications (

References

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