CVE-2026-65693
Received Received - Intake

Server-Side Template Injection in Microweber CMS

Publication date: 2026-07-24

Last updated on: 2026-07-24

Assigner: VulnCheck

Description
Microweber CMS through 2.0.20 contains a server-side template injection vulnerability that allows authenticated administrators to achieve arbitrary OS command execution by injecting Twig expressions into mail templates. Attackers can exploit the unsandboxed Twig environment in TwigView::render(), which lacks SandboxExtension or a SecurityPolicy, to inject malicious expressions such as filter('system') into mail template bodies stored unsanitized in the database, causing automatic payload execution on each subsequent application event that triggers a mail dispatch.

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Meta Information

Published
2026-07-24
Last Modified
2026-07-24
Generated
2026-07-24
AI Q&A
2026-07-24
EPSS Evaluated
N/A
NVD
CVE-2026-65693
EUVD
EUVD-2026-48665

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
microweber microweber_cms to 2.0.20 (inc)
microweber microweber to 2.0.20 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-94 The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.

Attack-Flow Graph

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Executive Summary

This vulnerability is a server-side template injection in Microweber CMS versions up to 2.0.20. Authenticated administrators can inject malicious Twig expressions into mail templates, which are then executed unsandboxed. This allows arbitrary OS command execution via the Twig environment, which lacks proper security policies.

Detection Guidance

Detecting this vulnerability requires checking for unauthorized mail template modifications or unsanitized Twig expressions in Microweber CMS. Inspect database entries for mail templates containing filter('system') or similar payloads. Review server logs for unexpected command execution events triggered by mail dispatches.

Impact Analysis

An attacker with admin access could execute arbitrary commands on the server, potentially leading to full system compromise. This includes data theft, malware installation, or disruption of services. The impact depends on the server's privileges and network access.

Compliance Impact

This vulnerability could lead to unauthorized data access or exfiltration, violating GDPR's data protection requirements or HIPAA's safeguards for protected health information. Non-compliance may result in legal penalties, fines, or reputational damage.

Mitigation Strategies

Immediately update Microweber CMS to the latest version beyond 2.0.20. Remove unsanitized mail templates from the database. Implement input validation for template content. Restrict administrative access to trusted users only. Monitor for unusual command execution or mail dispatch events.

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