SB2026060507 - Time-of-check Time-of-use (TOCTOU) Race Condition in Notepad++
Published: June 5, 2026
Security Bulletin ID
SB2026060507
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Time-of-check Time-of-use (TOCTOU) Race Condition (CVE-ID: N/A)
CWE-ID: CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Green
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to a time-of-check, time-of-use (TOCTOU) race condition between HMAC validation and command execution. A remote user can execute arbitrary commands on the target system.
Remediation
Install update from vendor's website.