Server-Side Template Injection in Naichen ThinkCMF Email Template
CVE-2026-102771

5.1MEDIUM

Key Information:

Vendor

Naichen

Status
Thinkcmf
Vendor
CVE Published:
29 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-102771?

A critical security vulnerability has been identified in the Naichen ThinkCMF version 8.0.7 and earlier. This issue resides in the MailController's templatePut function found in the MailController.php file of the Email Template component. The vulnerability arises from improper handling of special elements within the template engine, enabling remote attackers to execute unauthorized commands or manipulate the system. Despite early notification to the vendor, no response has been received regarding the potential exploit, raising concerns about the safety of users and data.

Affected Version(s)

ThinkCMF 8.0.0

ThinkCMF 8.0.1

ThinkCMF 8.0.2

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-2026-102771 - Proof of Concept

References

https://vuldb.com/vuln/411468
vdb-entrytechnical-description
https://vuldb.com/vuln/411468/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-102771
third-party-advisory

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
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

BlackSpdier (VulDB User)
VulDB CNA Team
.