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CVE-2026-22035: Greenshot Vulnerable to OS Command Injection via ExternalCommand Plugin

• Severity: high (CVSS 7.3 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: yes
• Published: 2026-01-08 · updated 2026-06-17
• Weakness: CWE-78

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.

Affected products

• greenshot: before 1.3.311 — fixed in 1.3.311

How to fix

Upgrade to a fixed version: greenshot 1.3.311. Check the vendor advisory for mitigations.

References

• https://github.com/greenshot/greenshot/commit/5dedd5c9f0a9896fa0af1d4980d875a48bf432cb
• https://github.com/greenshot/greenshot/releases/tag/v1.3.311
• https://github.com/greenshot/greenshot/security/advisories/GHSA-7hvw-q8q5-gpmj
• https://github.com/greenshot/greenshot/security/advisories/GHSA-7hvw-q8q5-gpmj

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