RCE in Frappe Erpnext
CVE-2025-66434
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.
Vulnerability class: RCE (Remote Code Execution)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (48.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
Weakness classification (CWE)
References
- www.notion.so/SSTI-bug-1-239e6086eadc8096bfcfe90551a3a483 (Exploit, Third Party Advisory)
- iamanc.github.io/post/erpnext-ssti-bug-1 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2025-66434?
- CVE-2025-66434 is a high-severity vulnerability in Frappe Erpnext, classified under Code Injection. CVSS score: 8.8/10. Published 2025-12-15.
- How severe is CVE-2025-66434?
- High severity. CVSS v3 base score is 8.8 out of 10.