CVE-2026-61211: Oracle Database RDBMS Privilege Escalation

CVE-2026-61211 Overview

CVE-2026-61211 is a critical access control vulnerability [CWE-284] in the Relational Database Management System (RDBMS) component of Oracle Database Server. The flaw affects Oracle Database versions 19.3-19.31 and 23.4.0-23.26.2. A low-privileged attacker holding the Execute DBMS_CLOUD privilege can exploit the vulnerability over Oracle Net to compromise the RDBMS. The vulnerability carries a scope change, meaning successful exploitation can impact additional products beyond the vulnerable database instance. Oracle published the advisory as part of the July 2026 Critical Patch Update.

Critical Impact
Successful exploitation results in full takeover of the RDBMS with high impact to confidentiality, integrity, and availability, and can affect components outside the database due to scope change.

Affected Products

Oracle Database Server RDBMS versions 19.3 through 19.31
Oracle Database Server RDBMS versions 23.4.0 through 23.26.2
Downstream products reachable through the affected RDBMS due to CVSS scope change

Discovery Timeline

2026-07-21 - CVE-2026-61211 published to NVD
2026-07-22 - Last updated in NVD database

Technical Details for CVE-2026-61211

Vulnerability Analysis

The vulnerability resides in the RDBMS component of Oracle Database Server and is classified as Improper Access Control [CWE-284]. An authenticated attacker with the EXECUTE privilege on the DBMS_CLOUD package can abuse that privilege to escalate access and take over the database. Because the attack triggers a scope change, actions performed through the compromised RDBMS can reach and impact adjacent Oracle products that trust the database security boundary. The Exploit Prediction Scoring System (EPSS) rates the probability of near-term exploitation at approximately 0.389% as of 2026-07-23. No public proof-of-concept or exploit-in-the-wild reports are recorded at the time of publication.

Root Cause

The root cause is insufficient access control enforcement within the DBMS_CLOUD PL/SQL package. The package exposes functionality that, when invoked by a user holding only the EXECUTE privilege, allows operations to be performed beyond the caller's authorization boundary. This breaks the least-privilege model expected between application-level roles and administrative database operations.

Attack Vector

The attack vector is Oracle Net (network) with low attack complexity and requires low privileges without user interaction. An attacker authenticates to the database as any account granted EXECUTE ON DBMS_CLOUD and issues crafted calls through the package to obtain administrative control. Because DBMS_CLOUD is commonly granted to application service accounts and integration users, the exposure surface can be broad in enterprise deployments. Refer to the Oracle Security Alert July 2026 for authoritative details.

// No verified public proof-of-concept is available.
// The vulnerability is triggered by a low-privileged session invoking
// procedures within the DBMS_CLOUD package over Oracle Net. Consult the
// Oracle Security Alert July 2026 for vendor-authoritative technical detail.

Detection Methods for CVE-2026-61211

Indicators of Compromise

Unexpected EXECUTE calls against DBMS_CLOUD procedures from application or non-administrative accounts.
New privileged sessions, role grants, or DBA role assignments created shortly after DBMS_CLOUD activity.
Outbound network requests initiated by the database server to unfamiliar hosts or object storage endpoints.
Creation of new database directories, credentials, or external tables tied to DBMS_CLOUD operations.

Detection Strategies

Audit all executions of DBMS_CLOUD procedures using Oracle Unified Auditing and alert on invocations from non-approved accounts.
Correlate DBMS_CLOUD calls with subsequent DDL, GRANT, or ALTER USER statements in the same session.
Baseline which accounts hold EXECUTE ON DBMS_CLOUD and alert on new grants of that privilege.
Ingest Oracle audit logs into a centralized SIEM to detect privilege abuse patterns across sessions.

Monitoring Recommendations

Forward Oracle Unified Audit trails and listener logs into Singularity Data Lake for real-time correlation with endpoint and identity telemetry.
Monitor database server hosts with Singularity Endpoint to detect post-exploitation activity such as credential theft or lateral movement.
Track outbound network flows from database hosts to identify data exfiltration or command-and-control channels.

How to Mitigate CVE-2026-61211

Immediate Actions Required

Apply the July 2026 Oracle Critical Patch Update to all affected Oracle Database Server instances.
Inventory every account and role currently granted EXECUTE ON DBMS_CLOUD and revoke the privilege where it is not strictly required.
Restrict Oracle Net listener exposure so only trusted application tiers can reach affected database instances.
Rotate credentials for accounts that held DBMS_CLOUD execute rights prior to patching.

Patch Information

Oracle addressed CVE-2026-61211 in the July 2026 Critical Patch Update. Administrators must apply the corresponding RDBMS patch for their release train, covering the affected 19.3-19.31 and 23.4.0-23.26.2 version ranges. Full patch identifiers and platform-specific bundles are listed in the Oracle Security Alert July 2026.

Workarounds

Revoke EXECUTE on DBMS_CLOUD from any role or user that does not have a documented business requirement.
Enforce network segmentation and Oracle Net access control lists to limit which hosts can authenticate to the database.
Enable Oracle Unified Auditing policies covering DBMS_CLOUD and privilege-changing statements until patching is complete.

bash

# Review and revoke DBMS_CLOUD execute privileges
sqlplus / as sysdba <<'SQL'
SELECT grantee, privilege
  FROM dba_tab_privs
 WHERE table_name = 'DBMS_CLOUD'
   AND privilege = 'EXECUTE';

-- Revoke where not required
REVOKE EXECUTE ON DBMS_CLOUD FROM <account_or_role>;

-- Enable auditing on the package
AUDIT EXECUTE ON SYS.DBMS_CLOUD BY ACCESS;
SQL