CVE-2025-66434: An SSTI (Server-Side Template Injection) vulnerability exists in the get_dunning_letter_text method of Frappe ERPNext…
CVE-2025-66434 · Severity: high · CVSS 8.8 · Published 2025-12-15
An SSTI (Server-Side Template Injection) vulnerability exists in the get_dunning_letter_text method of Frappe ERPNext through 15.89.0. The function renders attacker-controlled Jinja2 templates (body_text) using frappe.render_template() with a user-supplied context (doc). Although Frappe uses a custom SandboxedEnvironment, several dangerous globals such as frappe.db.sql are still available in the execution context via get_safe_globals(). An authenticated attacker with access to configure Dunning Type and its child table Dunning Letter Text can inject arbitrary Jinja expressions, resulting in server-side code execution within a restricted but still unsafe context. This can leak database information.
No. Junglewise Threat Intelligence has no report of CVE-2025-66434 being exploited in the wild.
How severe is CVE-2025-66434?
High severity, with a CVSS score of 8.8, published 15 December 2025.
Which products and versions are affected?
Frappe ERPNext. The advisory does not name versions.
Is there a fix for CVE-2025-66434?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2025-66434?
Check whether you run Frappe ERPNext. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.