Security readout for executives and security teams
Plain-English summary
CVE-2026-21931 affects Oracle APEX Sample Applications, specifically the Brookstrut Sample App. A low-privileged user with HTTP access could, with another user’s interaction, read or change some accessible sample-application data. Oracle rates it CVSS 5.4, meaning moderate business risk, mainly to confidentiality and integrity rather than availability.
Executive priority
Treat this as a moderate-priority Oracle patch and exposure-management item. Focus first on internet-facing or widely accessible APEX environments. Because it affects sample applications, organizations may be able to reduce risk quickly by confirming whether the component is present and exposed.
Technical view
Affected versions are Oracle APEX Sample Applications 23.2.0, 23.2.1, 24.1.0, 24.2.0, and 24.2.1. The vector is network HTTP, low privileges, low complexity, user interaction required, scope changed, with low confidentiality and integrity impact and no availability impact. No CWE or root-cause detail is provided in the source bundle.
Likely exposure
Exposure is most likely where the affected Brookstrut Sample App is installed, reachable over HTTP, and accessible to low-privileged users. Internet exposure increases urgency, but internal deployments can still be at risk if authenticated users can reach the sample app and induce another user to interact.
Exploitation context
The sources do not show CISA KEV listing or active exploitation. Exploitation requires a low-privileged attacker, network access via HTTP, and human interaction by someone other than the attacker. Oracle notes possible scope change, so effects may extend beyond the sample application boundary.
Researcher notes
Available public detail is limited. The advisory identifies the affected component, versions, CVSS vector, and impact class, but not the vulnerability class or precise root cause. Do not generalize this to all Oracle APEX components without vendor confirmation.
Mitigation direction
- Review Oracle’s January 2026 Critical Patch Update for official remediation guidance.
- Inventory Oracle APEX Sample Applications and identify affected versions.
- Prioritize externally reachable or broadly accessible sample application instances.
- Limit HTTP access to affected sample apps where business requirements allow.
- Remove or disable sample applications only if consistent with Oracle guidance and operational needs.
Validation and detection
- Confirm whether Oracle APEX Sample Applications are installed.
- Identify the Brookstrut Sample App version in each APEX environment.
- Check whether affected instances are reachable over HTTP.
- Determine which low-privileged users can access the sample app.
- Review application logs for unusual reads, updates, inserts, or deletes.
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-2026-21931 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
- Medium
- CVSS
- 5.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
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:L/UI:R/S:C/C:L/I:L/A:N2.32.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.4MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
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.