By simultaneously targeting the legacy Aura framework and modern Lightning Web Runtime, attackers are exploiting a lack of public documentation regarding Salesforce’s GraphQL data layer. This specific vulnerability allows the City-Forum campaign to bypass traditional security perimeters by communicating directly with the underlying data architecture of cloud-based portals. Unlike traditional attacks that rely on phishing or stolen credentials, this method leverages the inherent trust placed in API endpoints that support user-facing components. Organizations frequently deploy these portals to enhance customer engagement, yet the underlying GraphQL implementation often remains obscured from security audits due to its complexity and the speed of modern deployment cycles. As a result, the City-Forum threat actors can systematically query and retrieve sensitive records without ever triggering the standard alerts associated with unauthorized login attempts, making detection extremely difficult for most operations.
Technical Exploitation: The GraphQL Vulnerability Vector
The attackers utilize a sophisticated discovery process to identify public-facing Salesforce Experience Cloud sites that haven’t been properly hardened against unauthorized API access. Once a target is identified, the campaign employs a series of specialized GraphQL queries designed to probe the schema for available objects and fields that should typically be restricted to authenticated users. By crafting these requests to mimic legitimate component behavior, the City-Forum actors can circumvent the object-level security (OLS) and field-level security (FLS) settings if they are not strictly enforced at the API tier. This strategy effectively turns the flexibility of the GraphQL language into a weapon, allowing for the extraction of vast quantities of structured data in a single session. The efficiency of this method is high, as it avoids the noise generated by crawling thousands of individual web pages, instead focusing on the direct data conduits that power the modern web experience for businesses.
Furthermore, the campaign specifically exploits the transition period between the older Aura framework and the newer Lightning Web Runtime (LWR) environments. Many enterprises operate in a hybrid state where both architectures coexist, often leading to inconsistent security configurations across different parts of the same digital ecosystem. The City-Forum group capitalizes on these inconsistencies by using automated scripts to toggle between Aura-specific endpoints and the modern GraphQL interface used by LWR. This dual-track approach ensures that even if one framework is correctly secured, the other might remain vulnerable to data leakage through overlooked permissions. The lack of comprehensive, publicly accessible documentation regarding how these two systems interact with the shared data layer creates a significant blind spot. Security professionals often struggle to visualize the entire attack surface when the underlying technology is shifting so rapidly, leaving a gap for persistent threat actors.
Consequences and Strategic Hardening: Defensive Evolution
The primary objective of the City-Forum campaign is the mass harvesting of sensitive organizational data, including customer names, emails, internal employee directories, and proprietary business logic. By gaining access to these records, threat actors can facilitate secondary attacks such as highly targeted spear-phishing or identity theft on a massive scale. The data retrieved is not just limited to surface-level information; it often includes metadata that reveals the internal structure and operational workflows of the victim organization. This level of insight allows attackers to map out the digital footprint of a corporation, identifying further vulnerabilities in other cloud services or third-party integrations. Because these portals are often the face of a company, the exposure of customer data also leads to a catastrophic loss of brand trust and potentially severe regulatory penalties under global privacy laws. The silent nature of the extraction means that damage is done long before the breach is noticed.
Securing these environments required a fundamental shift in how organizations approached the permissions assigned to guest users and public profiles. Effective mitigation strategies involved the implementation of a strict ‘least privilege’ model for all Experience Cloud sites, ensuring that no data was accessible by default unless explicitly required for a public function. Administrators found that conducting regular audits of the Guest User Profile and using the Salesforce Sharing Sets or Sharing Rules was essential to closing the gaps identified by the City-Forum campaign. The transition to more robust security postures was characterized by a deeper collaboration between development teams and security operations, ensuring that security was baked into the deployment lifecycle. Ultimately, the industry moved toward a resilient architecture where the visibility of the data layer was tightly controlled and monitored. This shift prevented the campaign from achieving its long-term goals and provided a blueprint for securing cloud-based applications against similar API-focused threats.
