Security readout for executives and security teams
Plain-English summary
Oracle Hospitality OPERA 5 has a high-severity network-exploitable vulnerability in the Opera Servlet component. An unauthenticated attacker with HTTP access could read critical hotel system data, modify some data, and cause partial service disruption. This matters most for hospitality environments exposing OPERA services to untrusted networks.
Executive priority
Treat as urgent for hospitality operations using OPERA 5. The risk is unauthorized access to critical data, limited data modification, and partial outage without needing credentials. Prioritize internet- or broadly network-reachable deployments first.
Technical view
CVE-2026-21967 affects Oracle Hospitality OPERA 5 versions 5.6.19.23, 5.6.25.17, 5.6.26.10, and 5.6.27.4. CVSS 3.1 is 8.6, vector AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L. The vulnerable component is Opera Servlet. No CWE is provided in the source bundle.
Likely exposure
Systems running affected OPERA 5 versions are exposed if the Opera Servlet is reachable over HTTP, especially from the internet, guest networks, partner networks, or other untrusted segments.
Exploitation context
The source says exploitation is easy and requires only network access via HTTP, with no authentication or user interaction. The bundle does not cite active exploitation, and CISA KEV status is false.
Researcher notes
The public record names affected versions and impact but does not provide root cause, CWE, proof-of-concept status, or fixed version details in the supplied bundle. Avoid assuming exploit availability. Focus validation on version, component reachability, and vendor advisory status.
Mitigation direction
- Review Oracle’s January 2026 Critical Patch Update guidance for CVE-2026-21967.
- Apply Oracle-provided updates or remediation for affected OPERA 5 versions.
- Restrict HTTP access to OPERA services to trusted networks only.
- Monitor OPERA access logs for unusual unauthenticated activity.
- Prioritize systems handling guest, reservation, billing, or operational data.
Validation and detection
- Inventory Oracle Hospitality OPERA 5 deployments and versions.
- Confirm whether versions match 5.6.19.23, 5.6.25.17, 5.6.26.10, or 5.6.27.4.
- Identify whether Opera Servlet is reachable over HTTP.
- Verify network exposure from internet, guest, partner, and internal segments.
- Confirm Oracle advisory remediation has been applied where applicable.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2026-21967 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L3.94.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.6HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
Source materials
- CVE List V5 sourceCVE List V5
- Oracle AdvisoryCVE reference · vendor-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.