Server-Side Template Injection Vulnerability in Microweber CMS
CVE-2026-65693

8.6HIGH

Key Information:

Vendor

Microweber

Status
Microweber
Vendor
CVE Published:
24 July 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-65693?

Microweber CMS up to version 2.0.20 contains a vulnerability allowing authenticated administrators to execute arbitrary operating system commands. This occurs through the injection of Twig expressions into unsanitized mail templates. Due to the absence of necessary security mechanisms like SandboxExtension or a SecurityPolicy, attackers can exploit this flaw to run malicious code via crafted mail dispatch events. Successful exploitation can lead to severe compromise of system integrity, enabling unauthorized actions by leveraging the unsandboxed Twig rendering environment.

Affected Version(s)

microweber 0 <= 2.0.20

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-65693 - Proof of Concept

References

https://gist.github.com/W40X/584f4b088d310bc5280cc74bbf97...
technical-descriptionexploit
https://www.vulncheck.com/advisories/microweber-cms-serve...
third-party-advisory

CVSS V4

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Reju Kole
.