CVE-2026-83187 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 as well as unauthorized read access to a subset of Oracle Common Applications Calendar accessible data. CVSS 3.1 Base Score 7.1 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N).
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 09/16/2026
The Oracle Common Applications Calendar, a core component of the Oracle E-Business Suite platform, has been identified with a critical security flaw affecting versions 12.2.3 through 12.2.15. This vulnerability resides within the application layer and exposes organizations to significant risks regarding data integrity and confidentiality. The issue is characterized by an easily exploitable condition that allows attackers who possess low-level privileges and network access via HTTP to compromise the system. Unlike vulnerabilities requiring high-privileged accounts or complex user interaction, this flaw can be leveraged by users with minimal initial access rights, thereby lowering the barrier for entry significantly within environments where internal trust boundaries may be loosely defined or compromised through social engineering or credential theft.
From a technical perspective, the vulnerability enables unauthorized operations on critical data structures managed by the Applications Calendar module. Successful exploitation permits an attacker to create, delete, or modify sensitive information without proper authorization checks. This capability directly impacts the integrity of business-critical records such as scheduling data, resource allocations, and associated metadata. Furthermore, the flaw grants unauthorized read access to a subset of accessible data within the calendar system. While the availability impact is listed as none in the provided metrics, the ability to alter or exfiltrate specific subsets of data can lead to severe operational disruptions, including incorrect meeting schedules, compromised project timelines, and exposure of proprietary business information embedded within calendar entries.
The severity of this vulnerability is quantified by a CVSS 3.1 Base Score of 7.1, indicating a High risk level. The vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N) highlights that the attack surface is network-accessible with low complexity and requires no user interaction. However, it does require low privileges to initiate the exploit. The high integrity impact suggests that an attacker can significantly alter system data, which aligns with Common Weakness Enumeration (CWE) categories such as CWE-269: Improper Privilege Management or CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component if the flaw involves injection mechanisms. The confidentiality impact is rated lower but still present, suggesting that while full data exposure might not be guaranteed for all records, sensitive subsets are vulnerable to unauthorized viewing.
In terms of threat modeling and adversary behavior, this vulnerability maps closely to MITRE ATT&CK techniques related to privilege escalation or lateral movement within the application layer. Specifically, it resembles T1078: Valid Accounts if an attacker uses stolen low-privileged credentials, or potentially T1564: Hidden Files and Directories if the modification involves obscuring changes from administrators. The ability to modify critical data without detection poses a long-term risk as attackers may establish persistence by altering calendar entries to hide malicious activities or disrupt business continuity over time. Organizations must recognize that low-privileged access is no longer a safe boundary for protecting high-value application logic and data integrity in modern enterprise suites.
Mitigation strategies should prioritize immediate patching of the Oracle E-Business Suite environment to apply the latest security updates provided by Oracle, specifically targeting versions 12.2.3 through 12.2.15. In addition to software remediation, organizations should enforce strict network segmentation to limit HTTP access to the Applications Calendar component from untrusted networks. Implementing Web Application Firewalls (WAF) with rulesets tuned for detecting injection patterns or unauthorized API calls can provide an additional layer of defense. Access control policies must be reviewed to ensure that low-privileged users do not have unnecessary write permissions on calendar data structures, adhering to the principle of least privilege. Regular auditing of application logs for anomalous creation, deletion, or modification events is also recommended to detect potential exploitation attempts early in the kill chain.