CVE-2026-22035

Greenshot Vulnerable to OS Command Injection via ExternalCommand Plugin

CVSS 7.8 HIGHEPSS 0.9%CWE-78

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 7.8EPSS 0.9%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

08 Jan 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

Affected products

greenshot · greenshot

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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