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Vulnerability Database/CVE-2026-81653

CVE-2026-81653: Photo Gallery WordPress Auth Bypass Flaw

CVE-2026-81653 is an authorization bypass flaw in Photo Gallery WordPress plugin allowing users to manipulate images across all galleries. This post explains its impact, affected versions, and mitigation steps.

Published:

CVE-2026-81653 Overview

CVE-2026-81653 affects the Photo Gallery, Sliders, Proofing WordPress plugin before version 4.5.0. The plugin fails to verify that a user acting on an image owns the gallery it belongs to. Users granted the gallery-management capability by an administrator can delete, copy, and re-tag any image on the site. This includes images stored in galleries owned by other users. The flaw is classified as an Insecure Direct Object Reference (IDOR) issue under [CWE-639].

Critical Impact

Authenticated users with gallery-management capability can manipulate images across gallery boundaries, breaking multi-user tenancy isolation on affected WordPress sites.

Affected Products

  • Photo Gallery, Sliders, Proofing WordPress plugin versions prior to 4.5.0
  • WordPress sites granting the plugin's gallery-management capability to non-administrator users
  • Multi-user WordPress deployments relying on the plugin for per-user gallery ownership

Discovery Timeline

  • 2026-09-20 - CVE-2026-81653 published to NVD
  • 2026-09-21 - Last updated in NVD database

Technical Details for CVE-2026-81653

Vulnerability Analysis

The plugin exposes image management actions such as delete, copy, and re-tag through server-side handlers keyed by image identifier. The handlers check that the requesting user holds the gallery-management capability but do not confirm ownership of the parent gallery. Any authenticated user with the capability can therefore reference an arbitrary image ID and perform destructive or modifying actions against it.

This pattern reflects a broken object-level authorization control. The plugin conflates capability checks with ownership checks, so a valid capability grant becomes an implicit grant over every gallery on the site. Impact is limited to image integrity and metadata, with no direct path to code execution or credential disclosure. Sites that delegate gallery-management to contributors, clients, or photographers face cross-tenant tampering risk until they upgrade to 4.5.0.

Root Cause

The root cause is missing authorization on the object being acted upon, as tracked by [CWE-639]. The plugin trusts the image identifier supplied in the request without joining it back to the current user's owned galleries.

Attack Vector

Exploitation requires network access to the WordPress site and an authenticated account holding the gallery-management capability. The attacker submits the plugin's image action endpoints with the identifier of a target image belonging to another user. See the WPScan Vulnerability Report for reference details.

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Detection Methods for CVE-2026-81653

Indicators of Compromise

  • Images deleted, duplicated, or re-tagged without a corresponding action by the owning user
  • Plugin action requests from user accounts that do not own the referenced gallery
  • Unexpected changes to gallery contents, tags, or image counts reported by users

Detection Strategies

  • Review WordPress access logs for plugin AJAX or admin-post requests that reference image IDs outside the requester's own galleries
  • Correlate image modification events with the acting user and compare against gallery ownership records in the plugin's database tables
  • Alert on high-volume image deletion or copy operations initiated by non-administrator accounts

Monitoring Recommendations

  • Enable WordPress audit logging for plugin actions, capturing user ID, action, and target image ID
  • Forward web server and PHP logs to a central analytics or SIEM tier for query and retention
  • Track the plugin version installed across managed WordPress instances and flag any below 4.5.0

How to Mitigate CVE-2026-81653

Immediate Actions Required

  • Upgrade the Photo Gallery, Sliders, Proofing plugin to version 4.5.0 or later on every WordPress site
  • Audit which user roles currently hold the plugin's gallery-management capability and revoke it where not required
  • Review recent image deletion, copy, and re-tag activity for actions performed across gallery boundaries

Patch Information

The vendor addressed the issue in version 4.5.0 of the plugin. Site administrators should update through the WordPress plugin manager or by deploying the patched release. Refer to the WPScan Vulnerability Report for advisory details.

Workarounds

  • Restrict the plugin's gallery-management capability to trusted administrator accounts until the update is applied
  • Isolate multi-tenant WordPress installations so that untrusted contributors cannot access galleries owned by other users
  • Take a full backup of the uploads directory and WordPress database to enable restoration if unauthorized image deletion occurs

Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.

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