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TI-2026-46827 Aliases CVE-2026-65693GHSA-5hv4-9f73-fvrj

Microweber CMS 2.0.20 Server-Side Template Injection via Mail Templates

Priority HIGH 72CWE-94Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-94.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00918 60th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
microwebermicroweberup to 2.0.20—No fix listedCNA
  • microweber Vendormicroweber Affected up to 2.0.20 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-65693
  2. 2026-10-03 Alias added: GHSA-5hv4-9f73-fvrj

References

Exploit 1

  • TI-2026-46828 Microweber CMS 2.0.20 Path Traversal via ServeStaticFileController CVSS 4.0HIGH 8.7
  • TI-2023-01763 Command Injection in microweber/microweber CVSS 3.1CRITICAL 9.8
  • TI-2023-02100 Improper Privilege Management in microweber/microweber CVSS 3.1HIGH 8.8
  • TI-2022-14518 Microweber v1.2.15 was discovered to allow attackers to perform an account takeover via a host header injection attack. CVSS 3.1HIGH 8.8
  • TI-2023-04891 Use of Hard-coded Credentials in microweber/microweber CVSS 3.1HIGH 7.5
  • TI-2025-37870 Microweber CMS 2.0 has Weak Password Requirements. CVSS 3.1HIGH 8.3
See all 120 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences