VulnerabilityPublished 20 Jan 2026

CVE-2026-21931: Easily exploitable vulnerability allows low privileged attacker with network access via HTTP to compromise Oracle APEX Sample Applications. Successful attacks require human interaction from a person other than the attacker and while the vulnerability is in Oracle APEX Sample Applications, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Oracle APEX Sample Applications accessible data as well as unauthorized read access to a subset of Oracle APEX Sample Applications accessible data.

Affects Oracle APEX Sample ApplicationsSource CVE Database V5

Not known to be exploited · CVSS 5.4 Medium.

Data as of 26 Oct 2026, 12:55 UTC

CVSS 3.1 base score

5.4Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.2% chance of exploitation in 30 days – higher than 12% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

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

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
User Interaction: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
Scope: Changed: An exploited vulnerability can affect resources beyond the security scope managed by the security authority of the vulnerable component. In this case, the vulnerable component and the impacted component are different and managed by different security authorities.
Confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 20 Jan 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
Oracle CorporationOracle APEX Sample Applications	Affected 23.2.0 – 24.2.1 5 affected builds	Fixed in–
Mavencom.oracle/apex-sample-applications`pkg:maven/com.oracle/apex-sample-applications`Other threats	Affected 23.2.0 – 24.2.1 5 affected builds	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

European organizations should immediately assess their Oracle APEX environments to identify deployments of the affected sample application versions (23.2.0 through 24.2.1). Where possible, upgrade to patched versions once Oracle releases fixes or apply any available interim mitigations such as disabling or restricting access to the vulnerable sample applications. Implement strict network segmentation and firewall rules to limit HTTP access to Oracle APEX environments only to trusted users and networks. Enhance user awareness training to reduce the risk of social engineering attacks that could trigger the required user interaction. Monitor Oracle APEX logs for unusual insert, update, or delete activities and unauthorized data access attempts. Employ Web Application Firewalls (WAF) with custom rules to detect and block suspicious HTTP requests targeting APEX sample applications. Finally, review and tighten application-level access controls to minimize privileges assigned to users and services interacting with Oracle APEX.

Description

CVE-2026-21931 is a medium severity vulnerability affecting Oracle APEX Sample Applications versions 23.2.0 through 24.2.1. It allows a low privileged attacker with network access via HTTP to perform unauthorized read and write operations on accessible data within these sample applications. Exploitation requires user interaction from a person other than the attacker, and successful attacks may impact additional Oracle products beyond the sample applications. The vulnerability has a CVSS 3.1 base score of 5.4, reflecting limited confidentiality and integrity impacts but no availability impact.

Impact

For European organizations, this vulnerability poses a risk of unauthorized data manipulation and disclosure within Oracle APEX environments, which are widely used for rapid web application development and deployment. The ability for a low privileged attacker to perform unauthorized insert, update, delete, and read operations could lead to data integrity issues, leakage of sensitive information, and potential compliance violations under regulations such as GDPR. The requirement for user interaction means phishing or social engineering could be leveraged to trigger exploitation, increasing the risk in environments with less stringent user awareness training. Additionally, the scope change indicates that exploitation could affect other Oracle products interconnected with APEX, potentially broadening the impact. Organizations in sectors such as finance, healthcare, and government, which often use Oracle technologies and handle sensitive data, may face increased operational and reputational risks if this vulnerability is exploited.

References

oracle.com/security-alerts/cpujan2026.html (opens in a new tab)

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 28 Jan 2026, 20:19 UTC

Technical details

References

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