Skip to main content

Oracle Database Server EUVDEUVD-2026-106807

| CVE-2026-91615 MEDIUM
Improper Access Control (CWE-284)
2026-10-20 secalert_us@oracle.com GHSA-vq22-5jhh-4fgj
6.3
CVSS 3.1 · Vendor: oracle
View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Authenticate with low-privilege DB account
  2. Exploit
    Reach Java VM over network via SOCKS5
  3. Execution
    Exploit high-complexity integrity flaw
  4. Impact
    Modify or delete critical data across scope boundary

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V8 - Authorization Access control enforcement
MITRE ATT&CK

1 technique across 1 tactic: Defense Evasion

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Exploitation Conditions

Exploitation requires a low-privileged authenticated account on the Oracle Database Server (PR:L) and network reachability to the Java VM component specifically via the SOCKS5 protocol pathway. The Java VM (Oracle JVM / OJVM) option must be installed and in use within the database for the component to be exposed. Limiting factors are significant: Oracle explicitly rates this 'Difficult to exploit' (AC:H), no user interaction is needed (UI:N), and impact is confined to data integrity (I:H) with no confidentiality or availability loss. The scope change (S:C) is the amplifying factor - a successful attack can impact additional products beyond the Java VM. Affected versions are 19.3-19.32, 21.3-21.23, and 23.4.0-23.26.3.

Impact

This is a moderate-priority issue, not a top-tier emergency, and the signals are largely consistent. The CVSS 3.1 vector (AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N, base 6.3) describes a network-reachable but hard-to-exploit flaw: AC:H reflects Oracle's own 'Difficult to exploit' language, PR:L means the attacker must already hold a low-privileged database account, and impact is integrity-only (I:H) with no confidentiality or availability loss. The scope change (S:C) is the one factor that elevates concern - a successful attack can reach products beyond the Java VM itself. No EPSS score, CISA KEV listing, or public POC was provided in the input, so there is no public exploit identified at time of analysis and no evidence of active or widespread exploitation. Note a wording conflict: the description says 'low privileged attacker having None privilege,' which is ambiguous, but the authoritative CVSS vector specifies PR:L, so exploitation is treated as requiring authentication. Overall, the combination of high attack complexity, an authentication prerequisite, and integrity-only impact keeps real-world risk well below the alarm implied by Oracle DB's ubiquity; prioritize patching in the normal quarterly cycle, prioritizing internet-exposed or multi-tenant database instances given the scope change.

Exploit ScenarioDerived

An attacker who already holds a low-privileged account on an affected Oracle Database instance reaches the Java VM component over the network via a SOCKS5 pathway and, after overcoming significant exploitation difficulty, manipulates data integrity. Because the flaw causes a scope change, the resulting unauthorized creation, deletion, or modification can extend to critical data in additional products beyond the Java VM. No public exploit code is identified at time of analysis, and the high complexity makes opportunistic mass exploitation unlikely.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
No patch listed yet 0.2% exploitation probability (EPSS)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisAIv1 – Oct 20, 2026

Oracle Database Server's Java VM (Oracle JVM/OJVM) component carries an integrity-only flaw affecting versions 19.3-19.32, 21.3-21.23, and 23.4.0-23.26.3, reachable by a low-privileged account with network access through the SOCKS5 pathway. Oracle explicitly rates the issue as difficult to exploit (AC:H), and impact is limited to unauthorized creation, deletion, or modification of critical and Java VM-accessible data, with a scope change (S:C) meaning additional products can be affected; confidentiality and availability are unaffected. This is a moderate-priority issue rather than a top-tier emergency, and no public exploit code or confirmed active exploitation (CISA KEV) was identified at time of analysis.

RemediationAI

Apply the fixes published in Oracle's October 2026 Critical Patch Update advisory (https://www.oracle.com/security-alerts/cpuoct2026.html), which is the authoritative source for the exact patched release numbers; the supplied data does not state specific fix versions, so confirm the target release against the advisory before upgrading and verify that the OJVM component is included in the patch set, since database-only updates may not address a Java VM flaw. Where patching must be deferred, reduce exposure by restricting network access to the database listener and the SOCKS5 pathway to trusted hosts only (trade-off: legitimate remote clients and application tiers lose connectivity unless explicitly allow-listed), and by removing or disabling the Oracle JVM option on instances that do not require Java stored procedures (trade-off: in-database Java code and dependent applications will fail). Additionally, enforce least privilege so that low-privileged accounts cannot reach OJVM functionality they do not need, and monitor for anomalous SOCKS5 traffic and unexpected DDL/DML activity against critical data, since the assessed impact is integrity-only and may otherwise go unnoticed.

Affected VersionsENISA

Oracle Database Server 19.3 ≤19.32
Oracle Database Server 23.4.0 ≤23.26.3
Oracle Database Server 21.3 ≤21.23

Affected Packages

euvd oracle_database_server no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

The affected component is Oracle JVM (OJVM), the embedded Java virtual machine option inside Oracle Database Server that runs Java stored procedures and in-database Java code. Exposure requires the OJVM option to be installed and in use, plus network reachability to the component via the SOCKS5 protocol pathway noted in the advisory. The CVSS 3.1 vector AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N describes a remotely reachable, high-complexity attack that requires a low-privileged authenticated account and no user interaction, produces a high integrity impact only, and crosses a security scope boundary so that products relying on the database can be impacted. No CWE identifier was supplied, so the precise root-cause class (for example, a sandbox or permission-check weakness in the Java VM) cannot be confirmed from the provided data, and no CPE strings were provided to narrow the platform footprint beyond the stated version ranges. The supplied tags 'Authentication Bypass', 'Java', and 'Oracle' are not elaborated by the advisory text and should not be read as confirming an authentication bypass beyond the PR:L prerequisite stated in the assessed vector.

Know when Java gets its next vulnerability

  • Watch products and get an email when something new is published
  • Check this CVE against your own stack and servers
  • Exploit and PoC references, threat intelligence from 22 sources

No credit card · 7-day full trial

Severity by source

Vendor (oracle) PRIMARY 6.3 MEDIUM
AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N
vuln.today AI 6.3 MEDIUM

Network-reachable via SOCKS5 but 'difficult to exploit' (AC:H), requires a low-privileged DB account (PR:L), integrity-only impact (I:H) with scope change to other products (S:C).

3.1 AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N
4.0 AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:L/SA:N

Primary rating from Vendor (oracle).

CVSS VectorVendor: oracle

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
High
Availability
None

DescriptionCVE.org

Vulnerability in the Java VM component of Oracle Database Server. Supported versions that are affected are 19.3-19.32, 21.3-21.23 and 23.4.0-23.26.3. Difficult to exploit vulnerability allows low privileged attacker having None privilege with network access via SOCKS5 to compromise Java VM. While the vulnerability is in Java VM, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Java VM accessible data. CVSS 3.1 Base Score 6.3 (Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N).

Threat Intelligence Overview

EPSS Score
0.2%
Top 88% exploitable
Prevalence
High
Oracle Database Server is widely deployed enterprise database software
Data Quality
4 sources
Confidence: Medium

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.2%
Patch available No
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

32
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +32
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

More in Java

View all
CVE-2012-4681 CRITICAL POC
9.8 Aug 28

Oracle Java SE 7 Update 6 and earlier contains multiple sandbox bypass vulnerabilities via the ClassFinder and forName m

CVE-2015-7450 CRITICAL POC
9.8 Jan 02

Remote code execution in IBM Sterling B2B Integrator, Sterling Integrator, and Tivoli Common Reporting allows unauthenti

CVE-2013-2465 CRITICAL POC
9.8 Jun 18

Java Runtime Environment sandbox bypass via incorrect image channel verification in 2D component allows remote unauthent

CVE-2011-3544 CRITICAL POC
9.8 Oct 19

Oracle Java SE JDK/JRE 7 and 6 Update 27 and earlier allows remote code execution with complete system compromise throug

CVE-2010-1871 HIGH POC
8.8 Aug 05

JBoss Seam 2 in Red Hat JBoss EAP 4.3.0 fails to sanitize JBoss Expression Language inputs, allowing remote attackers to

CVE-2012-1723 CRITICAL POC
9.8 Jun 16

Unspecified vulnerability in the Java Runtime Environment (JRE) component in Oracle Java SE 7 update 4 and earlier, 6 up

CVE-2013-0422 CRITICAL POC
9.8 Jan 10

Multiple vulnerabilities in Oracle Java 7 before Update 11 allow remote attackers to execute arbitrary code by (1) using

CVE-2012-0507 CRITICAL POC
9.8 Jun 07

Unspecified vulnerability in the Java Runtime Environment (JRE) component in Oracle Java SE 7 Update 2 and earlier, 6 Up

CVE-2015-4852 CRITICAL POC
9.8 Nov 18

The WLS Security component in Oracle WebLogic Server 10.3.6.0, 12.1.2.0, 12.1.3.0, and 12.2.1.0 allows remote attackers

CVE-2012-5076 CRITICAL POC
9.8 Oct 16

Unspecified vulnerability in the Java Runtime Environment (JRE) component in Oracle Java SE 7 Update 7 and earlier allow

CVE-2017-3066 CRITICAL POC
9.8 Apr 27

Remote unauthenticated attackers can execute arbitrary code on Adobe ColdFusion servers through Java deserialization fla

CVE-2012-0391 CRITICAL POC
9.8 Jan 08

The ExceptionDelegator component in Apache Struts before 2.2.3.1 interprets parameter values as OGNL expressions during

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy