CVE-2026-13175 in Eventin Plugin
Summary
by MITRE • 08/19/2026
The Eventin WordPress plugin before 4.1.21 does not verify ownership before allowing schedule records to be modified or deleted, allowing users with contributor-level access and above to alter or delete schedule entries created by other users.
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Analysis
by VulDB Data Team • 08/19/2026
The vulnerability identified in the Eventin WordPress plugin prior to version 4.1.21 represents a critical failure in server-side authorization logic, specifically categorized under CWE-862 Missing Authorization. This flaw allows authenticated users with contributor-level access and above to bypass intended security boundaries by modifying or deleting schedule records that they do not own. In typical web application architectures, particularly those built on the WordPress framework, role-based access control is expected to enforce strict separation between user identities and their permitted actions. However, in this instance, the plugin fails to validate whether the authenticated user initiating a request for modification or deletion actually possesses ownership of the target resource. This oversight creates a direct path for unauthorized data manipulation, undermining the integrity of the application's core functionality which revolves around event scheduling and management.
From an operational perspective, the impact of this vulnerability is significant for any organization relying on Eventin to manage public-facing events or internal schedules. An attacker with contributor-level access can alter dates, times, locations, or descriptions of events created by other users, potentially causing confusion among attendees or disrupting business operations. More severely, the ability to delete schedule entries allows an adversary to remove critical information entirely, leading to data loss and service disruption. Since WordPress contributors often have elevated privileges compared to standard subscribers but are not necessarily administrators, this vulnerability exposes a large surface area of potential attackers who may be legitimate users with compromised credentials or malicious insiders seeking to cause harm without needing full administrative control over the site.
This type of flaw aligns closely with the OWASP Top 10 category for Broken Access Control and maps directly to MITRE ATT&CK technique T1530, which involves Data from Information Repositories. The attacker leverages valid credentials to access a repository (the event schedule database) and performs unauthorized actions against specific objects within that repository. Unlike blind injection attacks or privilege escalation exploits, this vulnerability relies on the application's failure to enforce object-level permissions during routine CRUD operations. Consequently, automated scanning tools might not immediately flag this issue unless they are specifically configured to test for horizontal privilege escalation by attempting to manipulate resources associated with different user IDs in sequential requests.
Mitigation strategies must focus on immediate patching and enhanced access control verification. The primary remediation is to upgrade the Eventin plugin to version 4.1.21 or later, where this ownership check has been implemented. For organizations unable to update immediately due to compatibility concerns with other plugins, a temporary workaround involves restricting contributor-level users from accessing event management features entirely by downgrading their role to subscriber if such functionality is not required for their workflow. Additionally, developers should implement rigorous server-side validation that checks the user ID associated with the current session against the owner_id field of the target record before processing any update or delete requests. Logging and monitoring mechanisms should also be enhanced to detect unusual patterns of event modification or deletion by users who do not typically perform such actions, providing an additional layer of defense through anomaly detection.