CVE-2021-26618: Tmax ToOffice arbitrary file creation vulnerability

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-02-18 · updated 2026-06-17
Weakness: CWE-20

Description

An improper input validation leading to arbitrary file creation was discovered in ToWord of ToOffice. Remote attackers use this vulnerability to execute arbitrary file included malicious code.

Affected products

TmaxSoft Co., Ltd ToOffice: before 3.15.6 — fixed in 3.15.6

How to fix

Upgrade to a fixed version: TmaxSoft Co., Ltd ToOffice 3.15.6. Check the vendor advisory for mitigations.

References

https://www.krcert.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=36456
https://www.krcert.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=36456

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