CVE-2026-22035Public exploit

Command execution via unsanitized screenshot filenames

Published Jan 8, 2026 · Updated Jan 8, 2026

OS command injection in Greenshot before 1.3.311 allows attackers to execute commands through crafted screenshot filenames. ExternalCommandDestination.FormatArguments inserts a user-controlled full path into a command template with string.Format without neutralizing shell metacharacters. Exploitation requires the ExternalCommand plugin to invoke a shell interpreter and a user to open the valid image and select the configured destination; commands run with that user's privileges.

CVSS severity7.8
High
EPSS probability1.05%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in Greenshot before 1.3.311 allows attackers to execute commands through crafted screenshot filenames. ExternalCommandDestination.FormatArguments inserts a user-controlled full path into a command template with string.Format without neutralizing shell metacharacters. Exploitation requires the ExternalCommand plugin to invoke a shell interpreter and a user to open the valid image and select the configured destination; commands run with that user's privileges.

The record

CVE
CVE-2026-22035
Published
Jan 8, 2026
Updated
Jan 8, 2026
Vendor
Greenshot
Product
Greenshot
Classifications
CWE-78, T1204.002, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.3.311

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Greenshot · Greenshotversion=< 1.3.311

Published CVSS scores

7.8GitHub Security AdvisoryCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1204.002User Execution: Malicious File
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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