RCE in Masci Banks

CVE-2026-44209

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.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (36.5th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 36.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-44209: held from 0.007 to 0.004.

EPSS over last 30 days · oldest: 0.007 · newest: 0.004 · change: -0.003

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-44209?
CVE-2026-44209 is a high-severity vulnerability in Masci Banks, classified under Improper Neutralization of Special Elements Used in a Template Engine. CVSS score: 7.5/10. Published 2026-05-26.
How severe is CVE-2026-44209?
High severity. CVSS v3 base score is 7.5 out of 10.