Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Frappe | Erpnext | <= 15.89.0 |
Related Weaknesses (CWE)
References
- https://iamanc.github.io/post/erpnext-ssti-bug-1ExploitThird Party Advisory
- https://www.notion.so/SSTI-bug-1-239e6086eadc8096bfcfe90551a3a483?source=copy_liExploitThird Party Advisory
FAQ
What is CVE-2025-66434?
CVE-2025-66434 is a vulnerability with a CVSS score of 8.8 (HIGH). 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_t...
How severe is CVE-2025-66434?
CVE-2025-66434 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-66434?
Check the references section above for vendor advisories and patch information. Affected products include: Frappe Erpnext.