CVE-2026-93506 in SveltyCMS
Summary
by MITRE • 09/18/2026
A vulnerability was determined in SveltyCMS 0.0.6. This issue affects some unknown processing of the file /mediagallery/upload-media of the component File Upload Endpoint. Executing a manipulation can lead to server-side request forgery. The attack can be launched remotely. This patch is called 05b4f9efeb79e9d72a693232334d7529687f896f. It is best practice to apply a patch to resolve this issue.
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Analysis
by VulDB Data Team • 09/18/2026
The identified vulnerability in SveltyCMS version 0.0.6 represents a critical security flaw within the file upload functionality, specifically targeting the /mediagallery/upload-media endpoint. This component is responsible for handling media files uploaded by users or administrators through the content management system interface. The core issue lies in how the application processes input data during this specific operation, leading to an insecure direct object reference pattern that allows attackers to manipulate server-side requests. By exploiting this weakness, a remote attacker can force the vulnerable web application to send crafted HTTP requests to unintended internal or external destinations under the context of the running application process. This type of flaw is categorized under CWE-918, which addresses Server-Side Request Forgery (SSRF), indicating that the system fails to properly validate and sanitize URLs or resource identifiers provided during file upload operations before processing them on the server side.
The operational impact of this vulnerability is significant because it enables remote code execution scenarios indirectly through SSRF techniques. An attacker located at a distance can leverage this flaw to probe internal network services, access sensitive configuration files residing on local servers, or interact with cloud metadata endpoints that often contain authentication credentials and secret keys. Since the attack vector is remote, no prior authentication may be required depending on the specific implementation of the upload endpoint's access controls, although even authenticated users could exploit it for lateral movement within a protected network environment. The ability to initiate requests from the server itself bypasses many traditional perimeter security defenses such as firewalls and intrusion detection systems that typically monitor external inbound traffic but do not inspect outbound requests originating from trusted internal applications.
From an offensive security perspective, this vulnerability aligns with ATT&CK technique T1598, specifically Phishing for Inbound Traffic or Defacement via SSRF depending on the payload used, though it most closely maps to techniques involving server-side request manipulation for reconnaissance and credential theft. The lack of proper validation allows attackers to craft malicious file metadata or parameters that trigger internal API calls, database queries, or web service interactions without user consent. This can lead to data exfiltration, where sensitive information stored in backend systems is retrieved by the attacker via their controlled server receiving the response from the SSRF request. It also poses a risk of denial of service if the vulnerability is used to trigger infinite loops or resource-intensive internal processes within the CMS infrastructure.
To mitigate this vulnerability and secure the SveltyCMS environment, it is imperative to apply the patch identified by commit hash 05b4f9efeb79e9d72a693232334d7529687f896f immediately. This update likely introduces stricter input validation and output encoding mechanisms for the file upload endpoint, ensuring that only expected and safe values are processed during media gallery operations. In addition to applying the patch, administrators should implement network-level controls such as egress filtering to restrict outbound connections from the web server to known internal services only. Deploying a Web Application Firewall can also help detect and block SSRF attempts by analyzing request patterns for suspicious URL structures or private IP addresses in outgoing traffic. Regular security audits and penetration testing focused on file upload functionalities are recommended to identify similar weaknesses across other components of the CMS before they can be exploited by malicious actors seeking unauthorized access to internal resources.