Banks v2.4.2: SSTI RCE via unsandboxed Jinja2 template before 2.4.2
CVE-2026-44209 Published on May 26, 2026
Banks: Critical Remote Code Execution (RCE) via Jinja2 SSTI
Banks generates meaningful LLM prompts using a template language that makes sense. Prior to 2.4.2, banks uses jinja2.Environment() (unsandboxed) to render prompt templates. Applications that pass user-supplied strings as the template argument to Prompt() are vulnerable to Server-Side Template Injection (SSTI), which can lead to Remote Code Execution (RCE) on the host system. This vulnerability is fixed in 2.4.2.
Vulnerability Analysis
CVE-2026-44209 can be exploited with network access, requires user interaction. This vulnerability is consided to have a high level of attack complexity. Public availability of a proof of concept (POC) exploit exists for CVE-2026-44209. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Types
What is an EL Injection Vulnerability?
The software constructs all or part of an expression language (EL) statement in a Java Server Page (JSP) using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended EL statement before it is executed.
CVE-2026-44209 has been classified to as an EL Injection vulnerability or weakness.
Products Associated with CVE-2026-44209
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Affected Versions
masci banks:- Version < 2.4.2 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.