SB2026090869 - Privilege escalation in Microsoft Power Automate Desktop
Published: September 8, 2026
Security Bulletin ID
SB2026090869
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Path traversal (CVE-ID: CVE-2026-77897)
CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CVSSv4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to perform directory traversal attacks.
The vulnerability exists due to input validation error when processing directory traversal sequences in Microsoft Power Automate Desktop. A local user can send a specially crafted HTTP request and read arbitrary files on the system, leading to privilege escalation.
Remediation
Install update from vendor's website.