Frappe ERPNext up to 15.89.0 Jinja2 Template render_template special elements used in a template engine

Summaryinfo

A vulnerability identified as critical has been detected in Frappe ERPNext up to 15.89.0. This impacts the function render_template of the component Jinja2 Template Handler. This manipulation causes improper neutralization of special elements used in a template engine. The identification of this vulnerability is CVE-2025-66436. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Frappe ERPNext up to 15.89.0. It has been declared as critical. Affected by this vulnerability is the function render_template of the component Jinja2 Template Handler. The manipulation with an unknown input leads to a improper neutralization of special elements used in a template engine vulnerability. The CWE definition for the vulnerability is CWE-1336. The product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

An SSTI (Server-Side Template Injection) vulnerability exists in the get_terms_and_conditions method of Frappe ERPNext through 15.89.0. The function renders attacker-controlled Jinja2 templates (terms) 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 create or modify a Terms and Conditions document can inject arbitrary Jinja expressions into the terms field, resulting in server-side code execution within a restricted but still unsafe context. This vulnerability can be used to leak database information.

It is possible to read the advisory at notion.so. This vulnerability is known as CVE-2025-66436 since 11/30/2025. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 12/24/2025). The attack technique deployed by this issue is T1221 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Frappe

Name

• ERPNext

Version

• 15.0
• 15.1
• 15.2
• 15.3
• 15.4
• 15.5
• 15.6
• 15.7
• 15.8
• 15.9
• 15.10
• 15.11
• 15.12
• 15.13
• 15.14
• 15.15
• 15.16
• 15.17
• 15.18
• 15.19
• 15.20
• 15.21
• 15.22
• 15.23
• 15.24
• 15.25
• 15.26
• 15.27
• 15.28
• 15.29
• 15.30
• 15.31
• 15.32
• 15.33
• 15.34
• 15.35
• 15.36
• 15.37
• 15.38
• 15.39
• 15.40
• 15.41
• 15.42
• 15.43
• 15.44
• 15.45
• 15.46
• 15.47
• 15.48
• 15.49
• 15.50
• 15.51
• 15.52
• 15.53
• 15.54
• 15.55
• 15.56
• 15.57
• 15.58
• 15.59
• 15.60
• 15.61
• 15.62
• 15.63
• 15.64
• 15.65
• 15.66
• 15.67
• 15.68
• 15.69
• 15.70
• 15.71
• 15.72
• 15.73
• 15.74
• 15.75
• 15.76
• 15.77
• 15.78
• 15.79
• 15.80
• 15.81
• 15.82
• 15.83
• 15.84
• 15.85
• 15.86
• 15.87
• 15.88
• 15.89.0

CPE 2.3info

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CPE 2.2info

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