Acronis True Image prior to 2021 Update 4 for Windows allowed local privilege escalation due to DLL hijacking.

Acronis True Image prior to 2021 Update 4 for Windows allowed local privilege escalation due to improper soft link handling (issue 1 of 2).

Acronis True Image prior to 2021 Update 4 for Windows and Acronis True Image prior to 2021 Update 5 for macOS allowed an unauthenticated attacker (who has a local code execution ability) to tamper with the micro-service API.

Acronis True Image prior to 2021 Update 4 for Windows, Acronis True Image prior to 2021 Update 5 for Mac, Acronis Agent prior to build 26653, Acronis Cyber Protect prior to build 27009 did not implement SSL certificate validation.

Acronis True Image prior to 2021 Update 4 for Windows allowed local privilege escalation due to improper soft link handling (issue 2 of 2).

Acronis True Image prior to 2021 Update 5 for Windows allowed local privilege escalation due to insecure folder permissions.

Acronis True Image through 2021 on macOS allows local privilege escalation from admin to root due to insecure folder permissions.

Acronis True Image 2019 update 1 through 2020 on macOS allows local privilege escalation due to an insecure XPC service configuration.

Acronis True Image for Mac before 2021 Update 4 allowed local privilege escalation due to insecure folder permissions.

An issue was discovered in Acronis True Image 2020 24.5.22510. anti_ransomware_service.exe keeps a log in a folder where unprivileged users have write permissions. The logs are generated in a predictable pattern, allowing an unprivileged user to create a hardlink from a (not yet created) log file to anti_ransomware_service.exe. On reboot, this forces the anti_ransomware_service to try to write its log into its own process, crashing in a SHARING VIOLATION. This crash occurs on every reboot.