CVE-2026-22035 Greenshot Vulnerable to OS Command Injection via ExternalCommand Plugin
Attackers can execute arbitrary OS commands via malicious filenames in Greenshot's ExternalCommand plugin due to unsanitized input processing.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-22035?
CVE-2026-22035 is a high-severity command injection vulnerability in greenshot, published on 8 Jan 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
Greenshot is an open source Windows screenshot utility. Versions 1.3.310 and below arvulnerable to OS Command Injection through unsanitized filename processing. The FormatArguments method in ExternalCommandDestination.cs:269 uses string.Format() to insert user-controlled filenames directly into shell commands without sanitization, allowing attackers to execute arbitrary commands by crafting malicious filenames containing shell metacharacters. This issue is fixed in version 1.3.311.
Weakness: CWE-78
Which versions are affected by CVE-2026-22035?
It affects 1 product.
Products include Getgreenshot Greenshot.
How do I fix CVE-2026-22035?
No fix has been published for CVE-2026-22035 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-22035 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-22035 exists.
Other vulnerabilities in greenshot
Sources
Also known as GHSA-7hvw-q8q5-gpmj.