vanyukov Offload, AI & Optimize with Cloudflare Images cf-images Plugin wp-config.php sanitize_text_field unrestricted upload

Summaryinfo

A vulnerability, which was classified as critical, has been found in vanyukov Offload, AI & Optimize with Cloudflare Images cf-images Plugin up to 1.10.2 on WordPress. Affected by this vulnerability is the function sanitize_text_field of the file wp-config.php. This manipulation of the argument account-id causes unrestricted upload. This vulnerability appears as CVE-2026-9860. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability has been found in vanyukov Offload, AI & Optimize with Cloudflare Images cf-images Plugin up to 1.10.2 on WordPress and classified as critical. Affected by this vulnerability is the function sanitize_text_field of the file wp-config.php. The manipulation of the argument account-id with an unknown input leads to a unrestricted upload vulnerability. The CWE definition for the vulnerability is CWE-434. The product allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The Offload, AI & Optimize with Cloudflare Images plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 1.10.2 via the 'account-id' parameter parameter. This is due to insufficient privilege enforcement on the cf_images_do_setup AJAX handler, which requires only the upload_files capability (Author+) rather than manage_options before writing to wp-config.php, combined with the absence of single-quote escaping — sanitize_text_field() does not strip single quotes, and filter_input(INPUT_POST) bypasses wp_magic_quotes() slashing — allowing a single quote in the account-id or api-key parameter to break out of the single-quoted PHP string literal in the write_config() define() statement. This makes it possible for authenticated attackers, with author-level access and above, to execute code on the server. This is possible because the 'cf-images-nonce' nonce required by the AJAX handler is exposed to all Author-level and above users on wp-admin/upload.php via the CFImages JavaScript object, meaning any upload-capable user can satisfy the nonce check and reach the vulnerable wp-config.php write path.

The weakness was presented by Yat Wu. It is possible to read the advisory at wordfence.com. This vulnerability is known as CVE-2026-9860 since 05/28/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/18/2026). The attack technique deployed by this issue is T1608.002 according to MITRE ATT&CK.

By approaching the search of inurl:wp-config.php it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-37840). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• WordPress Plugin

Vendor

• vanyukov

Name

• Offload, AI & Optimize with Cloudflare Images cf-images Plugin

Version

• 1.10.0
• 1.10.1
• 1.10.2

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion