CVE-2026-5821
HighCVSS 8.1Exploitation Probability (EPSS)
Low risk27th percentile - higher than 27% of all known CVEs
Summary
The Image Optimizer plugin for WordPress versions up to 1.7.4 is vulnerable to arbitrary file deletion due to insufficient path validation in the Image_Backup::remove() function. Backup file paths stored in post meta are used directly in file deletion operations without verifying they are within the uploads directory. An authenticated attacker with Author-level access can inject arbitrary absolute file paths into the backups array via the Custom Fields interface, leading to file deletion when the attachment is deleted.
Risk Assessment
An attacker can delete arbitrary files on the server within web server filesystem permissions, potentially causing denial of service, data loss, or security degradation.
Recommendation
Update the Image Optimizer plugin to the latest available version that includes path validation fixes. If no update is available, temporarily disable the plugin.
Related vulnerabilities
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- CVE-2026-82923Critical
The AI Website Builder WordPress plugin (GitHub build) 1.0.0 does not perform any authorisation or nonce check on its REST API routes, allowing unauthenticated attackers to install and activate plugins and themes, import content from a URL under their control, write a file of their choosing into the uploads directory, and delete site content and media. On a host that serves PHP from the uploads directory, that file write is remote code execution.
- CVE-2026-85085Critical
The Canva Android App before 2.376.0 allowed an external origin to be loaded in a privileged WebView. A threat actor who controls the page loaded by the user is able to communicate with Canva using the user’s session.
- CVE-2026-70403Critical
XING CPTrans-ME-X contains a Use of Hard-coded Password (CWE-259). Anyone with the knowledge of the credential may log in to the affected device.
- CVE-2026-69657Critical
XING CPTrans-ME-X contains a Use of Default Password (CWE-1393). Anyone with the knowledge of the credential may log in to the affected device.
- CVE-2026-62928Critical
XING CPTrans-ME-X contains an OS Command Injection (CWE-78). Unauthenticated OS command may be injected.
- CVE-2026-15354Critical
The ACPT (Premium) plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 2.0.66. This is due to missing authorization in the `submit()` function, which allows unauthenticated form submissions to control the target user ID before calling `wp_update_user()`. This makes it possible for unauthenticated attackers to overwrite any WordPress user's email address and password, including an administrator's, and take over the account. Successful exploitation requires a public ACPT user form that permits anonymous submissions.
- CVE-2026-85509Critical
FreeIPMI before version 1.6.19 contains a stack-based buffer overflow in the _read_fru_data function in libfreeipmi/fru/ipmi-fru.c when a BMC returns more bytes than requested.
- CVE-2026-85508Critical
The ipmi-oem tool in FreeIPMI before version 1.6.19 has a stack-based buffer overflow in the _output_dell_system_info_cmc_ipv6_info function in ipmi-oem/ipmi-oem-dell.c, triggered by the cmc-ipv6-info subcommand of dell get-system-info.
- CVE-2026-85507Critical
The ipmi-oem tool in FreeIPMI before version 1.6.19 has a stack-based buffer overflow in the _output_dell_system_info_cmc_info function in ipmi-oem/ipmi-oem-dell.c, triggered by the cmc-info subcommand of dell get-system-info.
Original NVD description (English source)
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.