CVE-2026-83186 in Common Applications Calendar
Summary
by MITRE • 09/16/2026
Vulnerability in the Oracle Common Applications Calendar product of Oracle E-Business Suite (component: Applications Calendar). Supported versions that are affected are 12.2.3-12.2.15. Easily exploitable vulnerability allows low privileged attacker with network access via HTTP to compromise Oracle Common Applications Calendar. Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Oracle Common Applications Calendar accessible data and unauthorized ability to cause a partial denial of service (partial DOS) of Oracle Common Applications Calendar. CVSS 3.1 Base Score 7.1 (Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L).
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Analysis
by VulDB Data Team • 09/16/2026
The vulnerability identified in the Oracle Common Applications Calendar component of Oracle E-Business Suite represents a significant security risk for organizations relying on this enterprise resource planning platform. The affected versions span from 12.2.3 through 12.2.15, indicating that a substantial portion of deployed instances may be susceptible to exploitation if they have not been patched or upgraded to the latest supported release. This flaw is classified as an easily exploitable vulnerability, which lowers the barrier for entry for malicious actors and increases the likelihood of successful attacks in environments where security hygiene practices are inconsistent. The presence of this weakness underscores the critical need for rigorous patch management strategies within enterprise IT infrastructure to mitigate exposure to known defects in widely used software components.
From a technical perspective, the core flaw allows an attacker with low privileges who has network access via HTTP to compromise the integrity and availability of the Oracle Common Applications Calendar system. The attack vector is remote over the network, requiring no user interaction or complex social engineering tactics, which classifies this as a straightforward exploitation scenario for threat actors possessing basic networking knowledge. The vulnerability primarily impacts data integrity by enabling unauthorized creation, deletion, or modification of critical data within the calendar application. This capability extends to all Oracle Common Applications Calendar accessible data, meaning that an attacker can alter schedules, appointments, and other time-sensitive information without authorization. Such manipulation can lead to significant operational disruptions, as business processes often depend on accurate scheduling and resource allocation managed by this module.
The impact of this vulnerability is further compounded by its effect on system availability. Successful exploitation allows the attacker to cause a partial denial of service against Oracle Common Applications Calendar. This means that while the entire E-Business Suite may remain operational, the specific calendar functionality becomes unreliable or inaccessible for legitimate users. In an enterprise environment where coordination across departments relies heavily on shared calendars and scheduling tools, even a partial outage can cascade into broader productivity losses, missed deadlines, and communication breakdowns among teams who depend on real-time visibility of resources and personnel availability. The combination of integrity loss and availability degradation creates a high-risk scenario that demands immediate attention from system administrators and security operations centers monitoring Oracle E-Business Suite environments.
The severity of this vulnerability is quantified by a CVSS 3.1 Base Score of 7.1, which falls into the High severity category. The vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L) highlights that while confidentiality remains unaffected, integrity is severely compromised with a high impact score, and availability suffers a low to moderate impact. This scoring reflects the potential for an attacker with low privileges to make substantial changes to data without being detected immediately, especially if logging mechanisms are not sufficiently robust or monitored in real time. The lack of required user interaction further elevates the risk profile, as automated scripts can potentially exploit this flaw at scale across multiple instances within a networked environment.
In terms of industry-standard classifications, this vulnerability aligns with CWE-269 Improper Privilege Management and CWE-78 OS Command Injection or similar injection flaws depending on the specific underlying code defect causing the unauthorized data manipulation. It also maps to MITRE ATT&CK techniques related to Remote Service Exploitation and Data Manipulation, specifically tactics involving Persistence if the attacker modifies calendar entries to maintain access or disrupt workflows over time. Understanding these mappings helps security teams contextualize the threat within broader attack frameworks and prioritize remediation efforts based on established risk models rather than relying solely on vendor advisories.
To mitigate this vulnerability, organizations must ensure that all instances of Oracle E-Business Suite running versions 12.2.3 through 12.2.15 are updated to a patched version released by Oracle after the disclosure of this issue. Applying the latest security patches is the primary defense against exploitation. Additionally, implementing network segmentation can help limit exposure by restricting HTTP access to the Applications Calendar component only from trusted internal subnets or specific application servers rather than exposing it broadly across the enterprise network. Deploying Web Application Firewalls with rules tailored to detect and block injection patterns associated with this flaw can provide an additional layer of defense in depth. Regular vulnerability scanning should be conducted to identify unpatched instances, and access controls should be reviewed to ensure that low-privileged accounts do not have unnecessary permissions within the calendar module. Monitoring logs for unusual data modification events or service disruptions related to the calendar component is also recommended to detect potential exploitation attempts early.