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TI-2026-17729 Aliases CVE-2026-22035

Greenshot Vulnerable to OS Command Injection via ExternalCommand Plugin

Priority HIGH 69CWE-78Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Required
Attack complexity
High
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-78.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.01032 63rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed greenshot (greenshot): 1.3.311

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
greenshotgreenshotbefore 1.3.3111.3.311Patch availableCNA
  • greenshot Vendorgreenshot Affected before 1.3.311 Fixed in 1.3.311 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:getgreenshot:greenshot:*:*:*:*:*:*:*:*before 1.3.311Vulnerablegreenshot
  • cpe:2.3:a:getgreenshot:greenshot:*:*:*:*:*:*:*:* Versions before 1.3.311 Vulnerable ·greenshot

Remediation

  • Fix · CNA greenshot (greenshot) Fixed in 1.3.311

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-22035

References

Exploit 1

Patch 1

Other 1

  • TI-2025-36692 Greenshot — Insecure .NET deserialization via WM_COPYDATA enables local code execution CVSS 3.1HIGH 8.4
  • TI-2023-17351 Greenshot 1.2.10 and below allows arbitrary code execution because .NET content is… CVSS 3.1HIGH 7.8
  • TI-2026-20856 Greenshot Vulnerable to OS Command Injection via ExternalCommand Plugin CVSS 3.1MEDIUM 6.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences