Vulnerability · Published Jul 24, 2026 · Assigned by VulnCheck

CVE-2026-65693Microweber CMS 2.0.20 Server-Side Template Injection via Mail Templates

High 7.2

In plain English

A high-severity code injection in microweber from microweber. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 60% of all known vulnerabilities).

Severity (CVSS 3.1)7.2High

Exploit odds (30 days)0.9%top 39.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
microweber	microweber	0 – through 2.0.20

Weakness: CWE-94 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

References

Researcher Disclosure technical-description, exploit
https://www.vulncheck.com/advisories/microweber-cms-server-side-template-injection-via-mail-templates third-party-advisory