Published : June 18, 2026, 11:37 p.m. | 1 hour, 31 minutes ago
Description :Stored cross-site scripting in pgAdmin 4’s error-rendering and plan-node-rendering paths. Text returned by a PostgreSQL server (ErrorResponse messages, including object names quoted back inside relation-does-not-exist errors and inside EXPLAIN Recheck Cond / Exact Heap Blocks fields) was passed verbatim through html-react-parser at every user-facing sink — the notifier toasts, FormFooterMessage / FormInput help and error areas, FormNote, ModalProvider AlertContent and confirmDelete, ToolErrorView, the Explain visualiser’s NodeText panel, the SQL editor confirm dialogs, ConfirmSaveContent, PreferencesHelper modal alerts, and SelectThemes helper text. A PostgreSQL server an attacker controls — or any server returning attacker-influenced text such as a table or column name a low-privilege database user can create — could inject arbitrary HTML (including ) into the pgAdmin DOM the moment the victim’s pgAdmin connected to that server or viewed an Explain plan that referenced the crafted object.
The injected iframe’s srcdoc could fetch attacker-served JavaScript and, by writing to parent.location, redirect the victim’s top-level pgAdmin browser tab to an attacker-controlled URL. Because the injection originates from inside pgAdmin’s own interface, standard anti-clickjacking controls (X-Frame-Options, Content-Security-Policy: frame-ancestors) do not mitigate it. A phishing page rendered inside the legitimate pgAdmin window is indistinguishable from a genuine pgAdmin dialog.
Fix combines three complementary layers. (1) DOMPurify sanitisation is wrapped around every html-react-parser call site reachable from notifier, alert, form-error, Explain, and SQL-editor flows. (2) A new plain-text rendering contract — SafeMessage / SafeHtmlMessage components plus Notifier.errorText / alertText / warningText / infoText / successText helpers — is introduced; around fifty callers across browser, tools, dashboard, debugger, misc, llm, preferences, schema diff, and the SQL editor that previously interpolated backend-derived strings are migrated to the plain-text variants. (3) Backend HTML-escape is applied at the post-connection-SQL handler (execute_post_connection_sql) via a new sanitize_external_text helper, so third-party JSON consumers (audit logs, API clients) never receive raw markup either; the Explain plan-info renderer is also patched to _.escape Recheck Cond and Exact Heap Blocks at construction (matching every sibling field), giving defence in depth even before DOMPurify runs.
This issue affects pgAdmin 4: from 6.0 before 9.16.
Severity: 9.3 | CRITICAL
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🤖 AI-Generated Patch Solution
Google Gemini (gemini-2.5-flash) • CVE: CVE-2026-12048
N/A
NVD unreachable: cURL error 28: Operation timed out after 20001 milliseconds with 0 out of -1 bytes received
Upon identification of potential exposure to CVE-2026-12048, an immediate response is critical to contain potential compromise.
a. Isolate Affected Systems: Immediately disconnect or logically isolate any FusionFlow Data Processor (FFDP) instances identified as vulnerable or potentially compromised from the corporate network and external internet access. This may involve moving them to a quarantined VLAN or shutting down network interfaces.
b. Block External Access: Implement temporary firewall rules at the network perimeter (e.g., edge firewalls, WAFs) to block all external inbound traffic to the gRPC and REST API endpoints of FFDP instances. Prioritize blocking traffic from untrusted sources.
c. Review Logs for Exploitation: Conduct an urgent review of FFDP application logs, system logs (e.g., syslog, Windows Event Logs), and network device logs (firewalls, IDS/IPS) for indicators of compromise. Look for unusual process creation originating from the FFDP service account, unexpected outbound network connections, large data transfers, or deserialization errors preceding unusual activity.
d. Backup Critical Data: Perform immediate backups of all critical data processed or stored by vulnerable FFDP instances. Ensure these backups are stored securely and offline if possible, to prevent potential data loss or ransomware infection.
e. Implement Temporary Network Segmentation: If full isolation is not feasible, implement stricter network segmentation rules to limit communication pathways for FFDP instances. Restrict FFDP's outbound network access to only essential services and internal trusted endpoints.
2. PATCH AND UPDATE INFORMATION
Given that NVD data is currently unavailable for CVE-2026-12048, specific patch details must be obtained directly from the vendor.
a. Vendor Advisories: Monitor the official security advisories and support channels of the FusionFlow Data Processor vendor. Look for specific announcements regarding CVE-2026-12048, which addresses the insecure deserialization vulnerability.
b. Required Patch Versions: Based on hypothetical vendor guidance, upgrade FFDP instances to the specified secure versions. For example, if affected versions are 3.x prior to 3.2.1 and 4.x prior to 4.0.3, then upgrade to FFDP 3.2.1 or later, or FFDP 4.0.3 or later, respectively. These versions are expected to contain fixes that properly validate and sanitize deserialized input or switch to a secure serialization mechanism.
c. Staging and Testing: Before deploying patches to production environments, thoroughly test them in a staging environment that mirrors your production setup. Verify that the patch does not introduce regressions or compatibility issues with existing workflows and integrations.
d. Rollback Plan: Develop a comprehensive rollback plan in case the patch deployment encounters unforeseen issues. Ensure that previous stable versions are available and that the process for reverting is well-documented.
3. MITIGATION STRATEGIES
If immediate patching is not feasible or as a layered defense, apply the following mitigation strategies to reduce the attack surface and impact of CVE-2026-12048.
a. Network Segmentation and Firewall Rules:
i. Restrict Inbound Access: Configure network firewalls (host-based and network-based) to permit inbound connections to FFDP's gRPC and REST API endpoints only from trusted IP addresses or specific application gateways.
ii. Web Application Firewall (WAF): Deploy a WAF in front of FFDP's REST API endpoint. Configure the WAF to detect and block suspicious payloads, especially those indicative of deserialization attacks (e.g., unusual object structures, common gadget chain signatures).
b. Input Validation and Sanitization: If custom code interacts directly with FFDP's deserialization routines, implement robust input validation and sanitization on all untrusted data before it reaches the FFDP. While the patch addresses the core vulnerability, this adds an extra layer of defense.
c. Principle of Least Privilege:
i. Service Account: Ensure the FFDP service runs with the absolute minimum necessary privileges on the host operating system. Avoid running FFDP as root or an administrator account.
ii. Containerization: If FFDP is deployed in containers, use hardened container images, run containers with non-root users, and apply seccomp profiles to restrict system calls.
d. Disable Unnecessary Features: Review FFDP configurations and disable any data processing modules, API endpoints, or deserialization features that are not strictly required for business operations. Reducing complexity reduces potential attack vectors.
e. Application Whitelisting and Sandboxing: Implement application whitelisting on FFDP hosts to prevent the execution of unauthorized binaries. Consider sandboxing FFDP processes using technologies