CVE-2026-102771Naichen ThinkCMF Email Template MailController.php templatePut special elements in template engine

5.1MediumCVSS base score
0.24%Exploitation in 30 daysEPSS · top 85% of all CVEs
NoKnown exploitednot in CISA's KEV catalog
YesPublic exploitsa reference or SSVC says so

Description

A security vulnerability has been detected in Naichen ThinkCMF up to 8.0.7. Affected by this issue is the function MailController::templatePut of the file cmf-api/src/admin/controller/MailController.php of the component Email Template. The manipulation leads to improper neutralization of special elements used in a template engine. The attack is possible to be carried out remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Public exploit

An exploit or proof of concept is public: anyone can try it against an unpatched system. A reference of the record is tagged as an exploit. CISA's SSVC rates its exploitation: a proof of concept is public.

Show the exploits1

References tagged exploit1 reference

https://github.com/coolcj-stack/ThinkCMF-v8.0.1-SSTI-Vulnerability/blob/main/ThinkCMF_Vulnerability_Report_EN.docx (opens in a new tab)exploit

Timeline

2026
29 Sept 2026
29 Sept 2026
ID reserved
By VulDB
29 Sept 2026
29 Sept 2026
Published
30 Sept 20261 day later
30 Sept 2026· 1 day later
Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-102771, by who scored it
Scored by	CVSS	Score	Vector
VulDBCNA (assigner)	4.0	Medium5.1	CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
VulDBCNA (assigner)	3.1	Medium4.7	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:C
VulDBCNA (assigner)	3.0	Medium4.7	CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:C
VulDBCNA (assigner)	2.0	Medium5.8	AV:N/AC:L/Au:M/C:P/I:P/A:P/E:POC/RL:ND/RC:C
NVDNVD · Deferred	4.0	Low2.0	CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS (exploitation in 30 days): 0.24% · top 85% of all CVEs (14 Nov 2026)
CISA SSVC: Exploitation: poc · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.1.

Affected products

Naichen · ThinkCMF
- affected 8.0.0
- affected 8.0.1
- affected 8.0.2
- affected 8.0.3
- affected 8.0.4
- affected 8.0.5
- affected 8.0.6
- affected 8.0.7

References5

VDB-411468 | Naichen ThinkCMF Email Template MailController.php templatePut special elements in template engine (opens in a new tab)vdb-entrytechnical-description
VDB-411468 | CTI Indicators (IOB, IOC, TTP, IOA) (opens in a new tab)signaturepermissions-required
CVE-2026-102771 | CVE Analysis and Report (opens in a new tab)third-party-advisory
Submit #943081 | Naichen (Shanghai) Information Technology Co., Ltd. ThinkCMF v8.0.1 Server-Side Template Injection (opens in a new tab)third-party-advisory
https://github.com/coolcj-stack/ThinkCMF-v8.0.1-SSTI-Vulnerability/blob/main/ThinkCMF_Vulnerability_Report_EN.docx (opens in a new tab)exploit

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

[![CVE-2026-102771](https://cveledger.app/badge/CVE-2026-102771.svg)](https://cveledger.app/cve/CVE-2026-102771)

Record last updated 30 Sept 2026, 14:01 UTC.