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Image Optimizer vulnerabilities
Image Optimizer has 2 known vulnerabilities in this database. The most recent published record is dated 30 Sep 2026.
- Known vulnerabilities
- 2
- Active installs
- 1m+
- Latest version
- 1.7.7
- Last updated
- 22 Sep 2026
- Most recent
- 30 Sep 2026
Find it in your WordPress dashboard under Plugins. Severity is based on the CVSS score published with the CVE where one is available.
| Vulnerability | Severity | Affected | Fix | Published |
|---|---|---|---|---|
| Sensitive data exposure CVE-2026-90953 | Medium 4.3 | Before 1.7.7 | Fixed in 1.7.7 | 7 d ago |
| Arbitrary file deletion CVE-2026-5821 | High 8.1 | Up to 1.7.4 | Fixed in a later version (latest 1.7.7) | 2 Jul 2026 |
Read the published descriptions
- CVE-2026-90953, 30 Sep 2026
- The Image Optimizer WordPress plugin before 1.7.7 does not enforce its intended capability check on several of its read REST routes, allowing any authenticated user to read attachment metadata and site-wide statistics that should be restricted to administrators. CVE record
- CVE-2026-5821, 2 Jul 2026
- The Image Optimizer plugin for WordPress is vulnerable to arbitrary file deletion in versions up to and including 1.7.4. This is due to insufficient path validation in the Image_Backup::remove() function where backup file paths stored in post meta are used directly in file deletion operations without verifying they are within the uploads directory. The plugin stores backup file paths in the image_optimizer_metadata post meta field and trusts these paths completely when deleting backups on the delete_attachment hook. An authenticated attacker with Author-level access can edit the image_optimizer_metadata post meta on their own attachments via WordPress's Custom Fields interface, injecting arbitrary absolute file paths into the backups array. When the attacker subsequently deletes the attachment, the plugin calls File_System::delete() on each path without validation. This makes it possible for authenticated attackers, with Author-level access and above, to delete arbitrary files on the server within the web server's filesystem permissions, potentially leading to denial of service, data loss, or security degradation. CVE record
What to do if you run Image Optimizer
If you run Image Optimizer, open WordPress and check the installed version in Plugins. Compare it with the affected versions in the vulnerability record. If a fixed version is available, take a current backup and update to that version or the latest supported release.
If no fixed version exists, consider disabling and removing the plugin or replacing it with a maintained alternative. After dealing with the affected software, check administrator users, unexpected file changes, redirects, unfamiliar pages and security logs for signs that the site may already have been altered.
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