CVE-2026-4361 in Divi Plugin
Summary
by MITRE • 09/05/2026
The Divi theme for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 4.27.6. This is due to the `et_pb_set_video_oembed_thumbnail_resolution()` function using `wp_remote_get()` instead of `wp_safe_remote_get()` to fetch a remote image URL, which does not restrict requests to private or reserved IP ranges. This makes it possible for authenticated attackers, with Contributor-level access and above, to make web requests to arbitrary locations originating from the web application server. The response body is not returned to the attacker (blind SSRF), but two oracles exist: a status oracle (the returned URL string differs depending on whether the target responded with HTTP 200) and a timing oracle (response time varies by target reachability).
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Analysis
by VulDB Data Team • 09/05/2026
The Divi theme for WordPress, specifically in versions up to and including 4.27.6, contains a critical Server-Side Request Forgery vulnerability within the `et_pb_set_video_oembed_thumbnail_resolution()` function. This flaw stems from an improper implementation of remote HTTP requests where the developer utilized the standard `wp_remote_get()` API call instead of the security-hardened `wp_safe_remote_get()`. The distinction is significant because `wp_safe_remote_get` includes built-in logic to block requests to private, reserved, and loopback IP addresses as well as other potentially dangerous internal networks. By bypassing this safety mechanism, the application fails to validate or restrict the destination of outbound network connections initiated by the theme's video embedding features. This architectural oversight allows any user with authenticated access at the Contributor level or higher to manipulate the target URL used for fetching thumbnail images from external sources.
From a technical perspective, this vulnerability is classified under CWE-918 Server-Side Request Forgery and aligns with MITRE ATT&CK technique T1571 which involves establishing communications through proxy servers or direct internal network access. The attacker leverages the video oembed functionality to inject malicious URLs that point towards internal infrastructure services such as database management interfaces, administrative panels, cloud metadata endpoints, or other sensitive backend systems. Although this is a blind SSRF scenario where the HTTP response body is not directly returned to the attacker in the initial request flow, it remains highly exploitable due to the presence of two distinct side-channel oracles. The first oracle relies on status code differentiation; if the internal target responds with an HTTP 200 OK versus other error codes like 403 Forbidden or 500 Internal Server Error, the application behaves differently in subsequent processing steps, allowing the attacker to infer success based on these variations.
The second exploitation vector involves a timing oracle where the response time of the server varies depending on whether the targeted internal host is reachable and responsive versus unreachable or blocking connections. By carefully measuring the latency of requests sent to different ports or services within the private network range, an authenticated low-privilege user can perform port scanning and service enumeration against internal assets that are otherwise isolated from direct external access. This capability effectively turns a standard WordPress installation into a pivot point for lateral movement within the organization's network perimeter. The impact extends beyond mere information disclosure as it facilitates unauthorized reconnaissance of internal architecture, potentially leading to further exploitation of other vulnerabilities present on those internal services such as SQL injection or authentication bypasses that are not exposed to the public internet.
Mitigation strategies must prioritize immediate patching by upgrading the Divi theme to version 4.27.7 or later where this function has been corrected to use `wp_safe_remote_get()`. In environments where updating is not immediately feasible, administrators should implement strict egress filtering rules at the network perimeter to restrict outbound connections from the web server application user to only known and necessary external domains. Additionally, deploying a Web Application Firewall with SSRF detection capabilities can help identify and block anomalous outbound requests originating from WordPress endpoints. It is also advisable to enforce principle of least privilege by ensuring that contributor-level accounts do not have access to video embedding features unless absolutely required for their role, thereby reducing the attack surface available to lower-privileged users who might attempt to exploit this blind SSRF mechanism.