CVE-2026-81651 in Photo Gallery Plugin
Summary
by MITRE • 09/20/2026
The Photo Gallery, Sliders, Proofing and WordPress plugin before 4.5.0 does not verify that the user saving a gallery owns it, allowing any user granted its gallery-management capability by an administrator to overwrite the stored settings of any gallery on the site, including its filesystem path, and including galleries belonging to other users.
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Analysis
by VulDB Data Team • 09/20/2026
The vulnerability identified in versions of the Photo Gallery, Sliders, Proofing and WordPress plugin prior to version 4.5.0 represents a critical failure in access control mechanisms within the application's backend logic. This flaw specifically targets the gallery management functionality, where the system fails to perform adequate authorization checks when processing requests that modify gallery configurations. In secure web applications, it is imperative that any operation modifying data associated with a specific resource must verify that the initiating user has ownership or explicit permission for that particular instance of the resource. However, in this scenario, the plugin accepts input parameters defining which gallery's settings are to be updated without validating whether the authenticated user submitting the request actually owns that gallery. This oversight allows any user account possessing the generic capability to manage galleries, as granted by a site administrator, to manipulate data belonging to other users or system-wide configurations.
From a technical perspective, this is a classic example of an Insecure Direct Object Reference (IDOR) vulnerability, which aligns with CWE-639 in the Common Weakness Enumeration taxonomy. The application relies on client-supplied identifiers for gallery IDs without cross-referencing them against the user's profile or ownership records stored in the database. Consequently, an attacker can craft malicious requests that specify arbitrary gallery identifiers, effectively bypassing intended security boundaries. This lack of object-level authorization means that the principle of least privilege is violated, as users are granted broader permissions than necessary for their specific role within the application ecosystem. The vulnerability stems from a design flaw where trust in user input regarding resource ownership is placed without server-side validation against authoritative data sources such as database records linking galleries to user accounts.
The operational impact of this vulnerability is severe due to the nature of the data being manipulated, specifically the filesystem path associated with each gallery. By overwriting these settings, an attacker can redirect the storage location for media files belonging to other users or critical site assets. This capability opens the door to several malicious outcomes beyond simple defacement or data corruption. An attacker could potentially overwrite paths to point towards sensitive system directories, leading to unauthorized file inclusion if combined with other vulnerabilities, or they could disrupt service availability by pointing galleries to non-existent or restricted locations. Furthermore, since this affects all users on the site who have gallery management capabilities, a single compromised account can be leveraged to escalate privileges and impact multiple stakeholders, undermining data integrity across the entire WordPress installation.
This behavior also aligns with techniques observed in the MITRE ATT&CK framework under the category of Defense Evasion or Privilege Escalation, specifically relating to abuse of access control mechanisms. The ability to modify filesystem paths suggests potential for further exploitation vectors such as Local File Inclusion (LFI) if the application subsequently uses these paths without sanitization when serving content. Additionally, it facilitates data exfiltration by allowing an attacker to redirect gallery storage to a location they can read or manipulate externally. For organizations relying on this plugin for media management and presentation, the integrity of stored images and associated metadata is compromised, leading to potential loss of trust in digital assets and operational disruption.
Mitigation strategies must prioritize immediate remediation through software updates. Administrators should upgrade the Photo Gallery, Sliders, Proofing and WordPress plugin to version 4.5.0 or later, where this authorization check has been implemented. Until an update is applied, site administrators can mitigate risk by restricting gallery management capabilities to only those users who absolutely require them, thereby reducing the attack surface. Implementing strict input validation on the server side for all object identifiers and ensuring that every write operation verifies ownership against database records are essential architectural corrections. Additionally, deploying a Web Application Firewall (WAF) with rules tuned to detect IDOR patterns can provide an additional layer of defense by blocking requests that attempt to access resources outside the user's authorized scope. Regular security audits focusing on authorization logic in custom plugins and third-party extensions are recommended to prevent similar vulnerabilities from persisting in WordPress environments.